CVE-2023-35943

Published: Jul 25, 2023Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, the CORS filter will segfault and crash Envoy when the `origin` header is removed and deleted between `decodeHeaders`and `encodeHeaders`. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, do not remove the `origin` header in the Envoy configuration.

Affected (4)

Products: Envoyproxy: Envoy

Envoyproxy

1 product

Envoy

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Envoyproxy Envoy	From 1.23.0 to 1.23.12
Envoyproxy Envoy	From 1.24.0 to 1.24.10
Envoyproxy Envoy	From 1.25.0 to 1.25.9
Envoyproxy Envoy	From 1.26.0 to 1.26.4

Related CWEs

CWE-416

Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (2)

https://github.com/envoyproxy/envoy/security/advisories/GHSA-mc6h-6j9x-v3gq

Source: security-advisories@github.com

ExploitThird Party Advisory

https://github.com/envoyproxy/envoy/security/advisories/GHSA-mc6h-6j9x-v3gq

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

Timeline

No history available yet.