Use After Free in Envoyproxy Envoy
CVE-2023-35943
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.
Vulnerability class: Use-After-Free
EPSS: 0.007 (47.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H.
Affected products
- Envoyproxy Envoy — versions >= 1.26.0, < 1.26.4, >= 1.25.0, < 1.25.9, >= 1.24.0, < 1.24.10
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-35943?
- CVE-2023-35943 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Use After Free. CVSS score: 6.3/10. Published 2023-07-25.
- How severe is CVE-2023-35943?
- Medium severity. CVSS v3 base score is 6.3 out of 10.