cve/2023/CVE-2023-27491.md

### [CVE-2023-27491](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27491)
![](https://img.shields.io/static/v1?label=Product&message=envoy&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3E%3D%201.25.0%2C%20%3C%201.25.3%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-20%3A%20Improper%20Input%20Validation&color=brighgreen)

### 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.

### POC

#### Reference
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp

#### Github
No PoCs found on GitHub currently.