Vulnerability Details CVE-2019-18277
A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.015
EPSS Ranking 79.9%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 4.3
Products affected by CVE-2019-18277
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cpe:2.3:a:haproxy:haproxy:-
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cpe:2.3:a:haproxy:haproxy:1.0.0
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cpe:2.3:a:haproxy:haproxy:1.0.1
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cpe:2.3:a:haproxy:haproxy:1.0.2
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cpe:2.3:a:haproxy:haproxy:1.1.0
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cpe:2.3:a:haproxy:haproxy:1.1.1
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cpe:2.3:a:haproxy:haproxy:1.1.10
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cpe:2.3:a:haproxy:haproxy:1.1.11
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cpe:2.3:a:haproxy:haproxy:1.1.12
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cpe:2.3:a:haproxy:haproxy:1.1.13
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cpe:2.3:a:haproxy:haproxy:1.1.14
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cpe:2.3:a:haproxy:haproxy:1.1.15
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cpe:2.3:a:haproxy:haproxy:1.1.16
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cpe:2.3:a:haproxy:haproxy:1.1.17
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cpe:2.3:a:haproxy:haproxy:1.1.18
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cpe:2.3:a:haproxy:haproxy:1.1.19
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cpe:2.3:a:haproxy:haproxy:1.1.2
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cpe:2.3:a:haproxy:haproxy:1.1.20
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cpe:2.3:a:haproxy:haproxy:1.1.21
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cpe:2.3:a:haproxy:haproxy:1.1.22
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cpe:2.3:a:haproxy:haproxy:1.1.23
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cpe:2.3:a:haproxy:haproxy:1.1.24
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cpe:2.3:a:haproxy:haproxy:1.1.25
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cpe:2.3:a:haproxy:haproxy:1.1.26
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cpe:2.3:a:haproxy:haproxy:1.1.27
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cpe:2.3:a:haproxy:haproxy:1.1.3
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cpe:2.3:a:haproxy:haproxy:1.1.4
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cpe:2.3:a:haproxy:haproxy:1.1.5
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cpe:2.3:a:haproxy:haproxy:1.1.6
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cpe:2.3:a:haproxy:haproxy:1.1.7
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cpe:2.3:a:haproxy:haproxy:1.1.8
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cpe:2.3:a:haproxy:haproxy:1.1.9
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cpe:2.3:a:haproxy:haproxy:1.2.0
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cpe:2.3:a:haproxy:haproxy:1.2.1
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cpe:2.3:a:haproxy:haproxy:1.2.10
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cpe:2.3:a:haproxy:haproxy:1.2.10.1
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cpe:2.3:a:haproxy:haproxy:1.2.11
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cpe:2.3:a:haproxy:haproxy:1.2.11.1
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cpe:2.3:a:haproxy:haproxy:1.2.12
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cpe:2.3:a:haproxy:haproxy:1.2.13
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cpe:2.3:a:haproxy:haproxy:1.2.13.1
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cpe:2.3:a:haproxy:haproxy:1.2.14
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cpe:2.3:a:haproxy:haproxy:1.2.15
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cpe:2.3:a:haproxy:haproxy:1.2.16
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cpe:2.3:a:haproxy:haproxy:1.2.17
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cpe:2.3:a:haproxy:haproxy:1.2.18
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cpe:2.3:a:haproxy:haproxy:1.2.2
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cpe:2.3:a:haproxy:haproxy:1.2.3
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cpe:2.3:a:haproxy:haproxy:1.2.4
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cpe:2.3:a:haproxy:haproxy:1.2.5
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cpe:2.3:a:haproxy:haproxy:1.2.5.1
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cpe:2.3:a:haproxy:haproxy:1.2.5.2
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cpe:2.3:a:haproxy:haproxy:1.2.6
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cpe:2.3:a:haproxy:haproxy:1.2.7
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cpe:2.3:a:haproxy:haproxy:1.2.7.1
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cpe:2.3:a:haproxy:haproxy:1.2.8
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cpe:2.3:a:haproxy:haproxy:1.2.9
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cpe:2.3:a:haproxy:haproxy:1.3.0
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cpe:2.3:a:haproxy:haproxy:1.3.1
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cpe:2.3:a:haproxy:haproxy:1.3.10
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cpe:2.3:a:haproxy:haproxy:1.3.10.1
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cpe:2.3:a:haproxy:haproxy:1.3.10.2
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cpe:2.3:a:haproxy:haproxy:1.3.11
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cpe:2.3:a:haproxy:haproxy:1.3.11.1
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cpe:2.3:a:haproxy:haproxy:1.3.11.2
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cpe:2.3:a:haproxy:haproxy:1.3.11.3
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cpe:2.3:a:haproxy:haproxy:1.3.11.4
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cpe:2.3:a:haproxy:haproxy:1.3.12
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cpe:2.3:a:haproxy:haproxy:1.3.12.1
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cpe:2.3:a:haproxy:haproxy:1.3.12.2
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cpe:2.3:a:haproxy:haproxy:1.3.12.3
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cpe:2.3:a:haproxy:haproxy:1.3.12.4
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cpe:2.3:a:haproxy:haproxy:1.3.13
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cpe:2.3:a:haproxy:haproxy:1.3.13.1
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cpe:2.3:a:haproxy:haproxy:1.3.13.2
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cpe:2.3:a:haproxy:haproxy:1.3.14
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cpe:2.3:a:haproxy:haproxy:1.3.14.1
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cpe:2.3:a:haproxy:haproxy:1.3.14.10
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cpe:2.3:a:haproxy:haproxy:1.3.14.11
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cpe:2.3:a:haproxy:haproxy:1.3.14.12
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cpe:2.3:a:haproxy:haproxy:1.3.14.13
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cpe:2.3:a:haproxy:haproxy:1.3.14.14
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cpe:2.3:a:haproxy:haproxy:1.3.14.2
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cpe:2.3:a:haproxy:haproxy:1.3.14.3
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cpe:2.3:a:haproxy:haproxy:1.3.14.4
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cpe:2.3:a:haproxy:haproxy:1.3.14.5
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cpe:2.3:a:haproxy:haproxy:1.3.14.6
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cpe:2.3:a:haproxy:haproxy:1.3.14.7
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cpe:2.3:a:haproxy:haproxy:1.3.14.8
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cpe:2.3:a:haproxy:haproxy:1.3.14.9
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cpe:2.3:a:haproxy:haproxy:1.3.15
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cpe:2.3:a:haproxy:haproxy:1.3.15.1
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cpe:2.3:a:haproxy:haproxy:1.3.15.10
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cpe:2.3:a:haproxy:haproxy:1.3.15.11
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cpe:2.3:a:haproxy:haproxy:1.3.15.2
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cpe:2.3:a:haproxy:haproxy:1.3.15.3
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cpe:2.3:a:haproxy:haproxy:1.3.15.4
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cpe:2.3:a:haproxy:haproxy:1.3.15.5
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cpe:2.3:a:haproxy:haproxy:1.3.15.6
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cpe:2.3:a:haproxy:haproxy:1.3.15.7
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cpe:2.3:a:haproxy:haproxy:1.3.15.8
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cpe:2.3:a:haproxy:haproxy:1.3.15.9
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cpe:2.3:a:haproxy:haproxy:1.3.16
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cpe:2.3:a:haproxy:haproxy:1.3.17
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cpe:2.3:a:haproxy:haproxy:1.3.18
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cpe:2.3:a:haproxy:haproxy:1.3.19
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cpe:2.3:a:haproxy:haproxy:1.3.2
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cpe:2.3:a:haproxy:haproxy:1.3.20
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cpe:2.3:a:haproxy:haproxy:1.3.21
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cpe:2.3:a:haproxy:haproxy:1.3.22
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cpe:2.3:a:haproxy:haproxy:1.3.23
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cpe:2.3:a:haproxy:haproxy:1.3.3
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cpe:2.3:a:haproxy:haproxy:1.3.4
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cpe:2.3:a:haproxy:haproxy:1.3.5
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cpe:2.3:a:haproxy:haproxy:1.3.6
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cpe:2.3:a:haproxy:haproxy:1.3.6.1
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cpe:2.3:a:haproxy:haproxy:1.3.7
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cpe:2.3:a:haproxy:haproxy:1.3.8
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cpe:2.3:a:haproxy:haproxy:1.3.8.1
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cpe:2.3:a:haproxy:haproxy:1.3.8.2
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cpe:2.3:a:haproxy:haproxy:1.3.9
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cpe:2.3:a:haproxy:haproxy:1.4
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cpe:2.3:a:haproxy:haproxy:1.4.0
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cpe:2.3:a:haproxy:haproxy:1.4.1
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cpe:2.3:a:haproxy:haproxy:1.4.10
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cpe:2.3:a:haproxy:haproxy:1.4.11
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cpe:2.3:a:haproxy:haproxy:1.4.12
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cpe:2.3:a:haproxy:haproxy:1.4.13
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cpe:2.3:a:haproxy:haproxy:1.4.14
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cpe:2.3:a:haproxy:haproxy:1.4.15
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cpe:2.3:a:haproxy:haproxy:1.4.16
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cpe:2.3:a:haproxy:haproxy:1.4.17
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cpe:2.3:a:haproxy:haproxy:1.4.18
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cpe:2.3:a:haproxy:haproxy:1.4.19
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cpe:2.3:a:haproxy:haproxy:1.4.2
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cpe:2.3:a:haproxy:haproxy:1.4.20
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cpe:2.3:a:haproxy:haproxy:1.4.21
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cpe:2.3:a:haproxy:haproxy:1.4.22
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cpe:2.3:a:haproxy:haproxy:1.4.23
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cpe:2.3:a:haproxy:haproxy:1.4.24
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cpe:2.3:a:haproxy:haproxy:1.4.25
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cpe:2.3:a:haproxy:haproxy:1.4.26
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cpe:2.3:a:haproxy:haproxy:1.4.27
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cpe:2.3:a:haproxy:haproxy:1.4.3
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cpe:2.3:a:haproxy:haproxy:1.4.4
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cpe:2.3:a:haproxy:haproxy:1.4.5
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cpe:2.3:a:haproxy:haproxy:1.4.6
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cpe:2.3:a:haproxy:haproxy:1.4.7
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cpe:2.3:a:haproxy:haproxy:1.4.8
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cpe:2.3:a:haproxy:haproxy:1.4.9
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cpe:2.3:a:haproxy:haproxy:1.5
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cpe:2.3:a:haproxy:haproxy:1.5.0
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cpe:2.3:a:haproxy:haproxy:1.5.1
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cpe:2.3:a:haproxy:haproxy:1.5.10
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cpe:2.3:a:haproxy:haproxy:1.5.11
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cpe:2.3:a:haproxy:haproxy:1.5.12
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cpe:2.3:a:haproxy:haproxy:1.5.13
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cpe:2.3:a:haproxy:haproxy:1.5.14
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cpe:2.3:a:haproxy:haproxy:1.5.15
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cpe:2.3:a:haproxy:haproxy:1.5.16
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cpe:2.3:a:haproxy:haproxy:1.5.17
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cpe:2.3:a:haproxy:haproxy:1.5.18
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cpe:2.3:a:haproxy:haproxy:1.5.2
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cpe:2.3:a:haproxy:haproxy:1.5.3
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cpe:2.3:a:haproxy:haproxy:1.5.4
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cpe:2.3:a:haproxy:haproxy:1.5.5
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cpe:2.3:a:haproxy:haproxy:1.5.6
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cpe:2.3:a:haproxy:haproxy:1.5.7
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cpe:2.3:a:haproxy:haproxy:1.5.8
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cpe:2.3:a:haproxy:haproxy:1.5.9
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cpe:2.3:a:haproxy:haproxy:1.6
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cpe:2.3:a:haproxy:haproxy:1.6.0
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cpe:2.3:a:haproxy:haproxy:1.6.1
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cpe:2.3:a:haproxy:haproxy:1.6.10
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cpe:2.3:a:haproxy:haproxy:1.6.11
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cpe:2.3:a:haproxy:haproxy:1.6.12
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cpe:2.3:a:haproxy:haproxy:1.6.13
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cpe:2.3:a:haproxy:haproxy:1.6.14
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cpe:2.3:a:haproxy:haproxy:1.6.2
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cpe:2.3:a:haproxy:haproxy:1.6.3
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cpe:2.3:a:haproxy:haproxy:1.6.4
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cpe:2.3:a:haproxy:haproxy:1.6.5
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cpe:2.3:a:haproxy:haproxy:1.6.6
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cpe:2.3:a:haproxy:haproxy:1.6.7
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cpe:2.3:a:haproxy:haproxy:1.6.8
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cpe:2.3:a:haproxy:haproxy:1.6.9
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cpe:2.3:a:haproxy:haproxy:1.7.0
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cpe:2.3:a:haproxy:haproxy:1.7.1
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cpe:2.3:a:haproxy:haproxy:1.7.10
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cpe:2.3:a:haproxy:haproxy:1.7.11
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cpe:2.3:a:haproxy:haproxy:1.7.2
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cpe:2.3:a:haproxy:haproxy:1.7.3
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cpe:2.3:a:haproxy:haproxy:1.7.4
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cpe:2.3:a:haproxy:haproxy:1.7.5
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cpe:2.3:a:haproxy:haproxy:1.7.6
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cpe:2.3:a:haproxy:haproxy:1.7.7
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cpe:2.3:a:haproxy:haproxy:1.7.8
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cpe:2.3:a:haproxy:haproxy:1.7.9
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cpe:2.3:a:haproxy:haproxy:1.8.0
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cpe:2.3:a:haproxy:haproxy:1.8.1
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cpe:2.3:a:haproxy:haproxy:1.8.10
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cpe:2.3:a:haproxy:haproxy:1.8.11
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cpe:2.3:a:haproxy:haproxy:1.8.12
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cpe:2.3:a:haproxy:haproxy:1.8.13
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cpe:2.3:a:haproxy:haproxy:1.8.14
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cpe:2.3:a:haproxy:haproxy:1.8.15
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cpe:2.3:a:haproxy:haproxy:1.8.16
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cpe:2.3:a:haproxy:haproxy:1.8.17
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cpe:2.3:a:haproxy:haproxy:1.8.18
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cpe:2.3:a:haproxy:haproxy:1.8.19
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cpe:2.3:a:haproxy:haproxy:1.8.2
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cpe:2.3:a:haproxy:haproxy:1.8.20
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cpe:2.3:a:haproxy:haproxy:1.8.21
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cpe:2.3:a:haproxy:haproxy:1.8.3
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cpe:2.3:a:haproxy:haproxy:1.8.4
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cpe:2.3:a:haproxy:haproxy:1.8.5
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cpe:2.3:a:haproxy:haproxy:1.8.6
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cpe:2.3:a:haproxy:haproxy:1.8.7
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cpe:2.3:a:haproxy:haproxy:1.8.8
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cpe:2.3:a:haproxy:haproxy:1.8.9
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cpe:2.3:a:haproxy:haproxy:1.9.0
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cpe:2.3:a:haproxy:haproxy:1.9.1
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cpe:2.3:a:haproxy:haproxy:1.9.10
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cpe:2.3:a:haproxy:haproxy:1.9.2
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cpe:2.3:a:haproxy:haproxy:1.9.3
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cpe:2.3:a:haproxy:haproxy:1.9.4
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cpe:2.3:a:haproxy:haproxy:1.9.5
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cpe:2.3:a:haproxy:haproxy:1.9.6
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cpe:2.3:a:haproxy:haproxy:1.9.7
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cpe:2.3:a:haproxy:haproxy:1.9.8
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cpe:2.3:a:haproxy:haproxy:1.9.9
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cpe:2.3:a:haproxy:haproxy:2.0.0
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cpe:2.3:a:haproxy:haproxy:2.0.1
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cpe:2.3:a:haproxy:haproxy:2.0.2
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cpe:2.3:a:haproxy:haproxy:2.0.3
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cpe:2.3:a:haproxy:haproxy:2.0.4
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cpe:2.3:a:haproxy:haproxy:2.0.5