Use After Free in Envoyproxy Envoy
CVE-2025-62504
Envoy is an open source edge and service proxy. Envoy versions earlier than 1.36.2, 1.35.6, 1.34.10, and 1.33.12 contain a use-after-free vulnerability in the Lua filter. When a Lua script executing in the response phase rewrites a respons…
Vulnerability class: Use-After-Free
EPSS: 0.004 (30.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Envoyproxy Envoy — versions >= 1.36.0, <= 1.36.1, >= 1.350, <= 1.35.5, >= 1.34.0, <= 1.34.9
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-62504?
- CVE-2025-62504 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Use After Free. CVSS score: 6.5/10. Published 2025-10-16.
- How severe is CVE-2025-62504?
- Medium severity. CVSS v3 base score is 6.5 out of 10.