CVE-2023-27491
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.87%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.87% probability · 57th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-444
- Affected
- envoyproxy/envoy
- Source
- security-advisories@github.com
References
- https://datatracker.ietf.org/doc/html/rfc9113#section-8.3Not Applicable
- https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1Not Applicable
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rpExploit, Vendor Advisory
- https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2Not Applicable
- https://datatracker.ietf.org/doc/html/rfc9113#section-8.3Not Applicable
- https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1Not Applicable
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rpExploit, Vendor Advisory
- https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2Not Applicable
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.