Vulnerability Details CVE-2020-36477
An issue was discovered in Mbed TLS before 2.24.0. The verification of X.509 certificates when matching the expected common name (the cn argument of mbedtls_x509_crt_verify) with the actual certificate name is mishandled: when the subjecAltName extension is present, the expected name is compared to any name in that extension regardless of its type. This means that an attacker could impersonate a 4-byte or 16-byte domain by getting a certificate for the corresponding IPv4 or IPv6 address (this would require the attacker to control that IP address, though).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 43.3%
CVSS Severity
CVSS v3 Score 5.9
CVSS v2 Score 4.3
References
Products affected by CVE-2020-36477
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cpe:2.3:a:arm:mbed_tls:-
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cpe:2.3:a:arm:mbed_tls:1.3.0
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cpe:2.3:a:arm:mbed_tls:1.3.1
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cpe:2.3:a:arm:mbed_tls:1.3.10
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cpe:2.3:a:arm:mbed_tls:1.3.11
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cpe:2.3:a:arm:mbed_tls:1.3.12
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cpe:2.3:a:arm:mbed_tls:1.3.13
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cpe:2.3:a:arm:mbed_tls:1.3.14
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cpe:2.3:a:arm:mbed_tls:1.3.15
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cpe:2.3:a:arm:mbed_tls:1.3.16
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cpe:2.3:a:arm:mbed_tls:1.3.17
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cpe:2.3:a:arm:mbed_tls:1.3.18
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cpe:2.3:a:arm:mbed_tls:1.3.19
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cpe:2.3:a:arm:mbed_tls:1.3.2
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cpe:2.3:a:arm:mbed_tls:1.3.20
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cpe:2.3:a:arm:mbed_tls:1.3.21
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cpe:2.3:a:arm:mbed_tls:1.3.22
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cpe:2.3:a:arm:mbed_tls:1.3.3
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cpe:2.3:a:arm:mbed_tls:1.3.4
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cpe:2.3:a:arm:mbed_tls:1.3.5
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cpe:2.3:a:arm:mbed_tls:1.3.6
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cpe:2.3:a:arm:mbed_tls:1.3.7
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cpe:2.3:a:arm:mbed_tls:1.3.8
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cpe:2.3:a:arm:mbed_tls:1.3.9
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cpe:2.3:a:arm:mbed_tls:2.0.0
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cpe:2.3:a:arm:mbed_tls:2.1.0
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cpe:2.3:a:arm:mbed_tls:2.1.1
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cpe:2.3:a:arm:mbed_tls:2.1.10
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cpe:2.3:a:arm:mbed_tls:2.1.11
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cpe:2.3:a:arm:mbed_tls:2.1.12
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cpe:2.3:a:arm:mbed_tls:2.1.13
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cpe:2.3:a:arm:mbed_tls:2.1.14
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cpe:2.3:a:arm:mbed_tls:2.1.15
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cpe:2.3:a:arm:mbed_tls:2.1.16
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cpe:2.3:a:arm:mbed_tls:2.1.17
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cpe:2.3:a:arm:mbed_tls:2.1.18
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cpe:2.3:a:arm:mbed_tls:2.1.2
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cpe:2.3:a:arm:mbed_tls:2.1.3
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cpe:2.3:a:arm:mbed_tls:2.1.4
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cpe:2.3:a:arm:mbed_tls:2.1.5
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cpe:2.3:a:arm:mbed_tls:2.1.6
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cpe:2.3:a:arm:mbed_tls:2.1.7
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cpe:2.3:a:arm:mbed_tls:2.1.8
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cpe:2.3:a:arm:mbed_tls:2.1.9
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cpe:2.3:a:arm:mbed_tls:2.10.0
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cpe:2.3:a:arm:mbed_tls:2.11.0
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cpe:2.3:a:arm:mbed_tls:2.12.0
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cpe:2.3:a:arm:mbed_tls:2.13.0
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cpe:2.3:a:arm:mbed_tls:2.13.1
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cpe:2.3:a:arm:mbed_tls:2.14.0
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cpe:2.3:a:arm:mbed_tls:2.14.1
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cpe:2.3:a:arm:mbed_tls:2.15.0
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cpe:2.3:a:arm:mbed_tls:2.15.1
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cpe:2.3:a:arm:mbed_tls:2.16.0
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cpe:2.3:a:arm:mbed_tls:2.16.1
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cpe:2.3:a:arm:mbed_tls:2.16.10
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cpe:2.3:a:arm:mbed_tls:2.16.11
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cpe:2.3:a:arm:mbed_tls:2.16.12
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cpe:2.3:a:arm:mbed_tls:2.16.2
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cpe:2.3:a:arm:mbed_tls:2.16.3
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cpe:2.3:a:arm:mbed_tls:2.16.4
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cpe:2.3:a:arm:mbed_tls:2.16.5
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cpe:2.3:a:arm:mbed_tls:2.16.6
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cpe:2.3:a:arm:mbed_tls:2.16.7
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cpe:2.3:a:arm:mbed_tls:2.16.8
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cpe:2.3:a:arm:mbed_tls:2.16.9
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cpe:2.3:a:arm:mbed_tls:2.17.0
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cpe:2.3:a:arm:mbed_tls:2.18.0
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cpe:2.3:a:arm:mbed_tls:2.18.1
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cpe:2.3:a:arm:mbed_tls:2.19.0
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cpe:2.3:a:arm:mbed_tls:2.19.1
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cpe:2.3:a:arm:mbed_tls:2.2.0
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cpe:2.3:a:arm:mbed_tls:2.2.1
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cpe:2.3:a:arm:mbed_tls:2.2.2
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cpe:2.3:a:arm:mbed_tls:2.2.3
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cpe:2.3:a:arm:mbed_tls:2.20.0
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cpe:2.3:a:arm:mbed_tls:2.21.0
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cpe:2.3:a:arm:mbed_tls:2.22.0
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cpe:2.3:a:arm:mbed_tls:2.23.0
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cpe:2.3:a:arm:mbed_tls:2.3.0
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cpe:2.3:a:arm:mbed_tls:2.3.1
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cpe:2.3:a:arm:mbed_tls:2.3.2
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cpe:2.3:a:arm:mbed_tls:2.4.0
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cpe:2.3:a:arm:mbed_tls:2.4.1
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cpe:2.3:a:arm:mbed_tls:2.4.2
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cpe:2.3:a:arm:mbed_tls:2.5.0
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cpe:2.3:a:arm:mbed_tls:2.5.1
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cpe:2.3:a:arm:mbed_tls:2.6.0
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cpe:2.3:a:arm:mbed_tls:2.6.1
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cpe:2.3:a:arm:mbed_tls:2.7.0
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cpe:2.3:a:arm:mbed_tls:2.7.1
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cpe:2.3:a:arm:mbed_tls:2.7.10
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cpe:2.3:a:arm:mbed_tls:2.7.11
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cpe:2.3:a:arm:mbed_tls:2.7.12
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cpe:2.3:a:arm:mbed_tls:2.7.13
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cpe:2.3:a:arm:mbed_tls:2.7.14
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cpe:2.3:a:arm:mbed_tls:2.7.15
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cpe:2.3:a:arm:mbed_tls:2.7.16
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cpe:2.3:a:arm:mbed_tls:2.7.17
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cpe:2.3:a:arm:mbed_tls:2.7.18
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cpe:2.3:a:arm:mbed_tls:2.7.19
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cpe:2.3:a:arm:mbed_tls:2.7.2
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cpe:2.3:a:arm:mbed_tls:2.7.3
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cpe:2.3:a:arm:mbed_tls:2.7.4
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cpe:2.3:a:arm:mbed_tls:2.7.5
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cpe:2.3:a:arm:mbed_tls:2.7.6
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cpe:2.3:a:arm:mbed_tls:2.7.7
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cpe:2.3:a:arm:mbed_tls:2.7.8
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cpe:2.3:a:arm:mbed_tls:2.7.9
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cpe:2.3:a:arm:mbed_tls:2.8.0
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cpe:2.3:a:arm:mbed_tls:2.9.0