Vulnerability Details CVE-2019-15226
Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.089
EPSS Ranking 92.2%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 7.8
References
- https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014
- https://github.com/envoyproxy/envoy/commits/master
- https://github.com/envoyproxy/envoy/issues/8520
- https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014
- https://github.com/envoyproxy/envoy/commits/master
- https://github.com/envoyproxy/envoy/issues/8520
Products affected by CVE-2019-15226
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cpe:2.3:a:envoyproxy:envoy:1.0.0
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cpe:2.3:a:envoyproxy:envoy:1.1.0
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cpe:2.3:a:envoyproxy:envoy:1.10.0
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cpe:2.3:a:envoyproxy:envoy:1.11.0
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cpe:2.3:a:envoyproxy:envoy:1.11.1
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cpe:2.3:a:envoyproxy:envoy:1.11.2
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cpe:2.3:a:envoyproxy:envoy:1.2.0
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cpe:2.3:a:envoyproxy:envoy:1.3.0
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cpe:2.3:a:envoyproxy:envoy:1.4.0
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cpe:2.3:a:envoyproxy:envoy:1.5.0
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cpe:2.3:a:envoyproxy:envoy:1.6.0
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cpe:2.3:a:envoyproxy:envoy:1.7.0
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cpe:2.3:a:envoyproxy:envoy:1.7.1
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cpe:2.3:a:envoyproxy:envoy:1.8.0
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cpe:2.3:a:envoyproxy:envoy:1.9.0
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cpe:2.3:a:envoyproxy:envoy:1.9.1