Vulnerability · Published Apr 4, 2023 · Assigned by GitHub_M

CVE-2023-27491Envoy forwards invalid Http2/Http3 downstream headers

Medium 5.4

In plain English

A medium-severity improper input validation in envoy from envoyproxy. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.9%top 40.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.

Affected products (as reported)

Vendor	Product	Versions
envoyproxy	envoy	>= 1.25.0, < 1.25.3>= 1.24.0, < 1.24.4>= 1.23.0, < 1.23.6< 1.22.9

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp x_refsource_CONFIRM
https://datatracker.ietf.org/doc/html/rfc9113#section-8.3 x_refsource_MISC
https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1 x_refsource_MISC
https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2 x_refsource_MISC