Use After Free in Envoyproxy Envoy
CVE-2025-54588
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. Versions 1.34.0 through 1.34.4 and 1.35.0 contain a use-after-free (UAF) vulnerability in the DNS cache, causing abnormal proc…
Vulnerability class: Use-After-Free
EPSS: 0.000 (2.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Envoyproxy Envoy — versions >= 1.34.0, < 1.34.5, >= 1.35.0, < 1.35.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-g9vw-6pvx-7gmw (x_refsource_CONFIRM)
- https://github.com/envoyproxy/envoy/releases/tag/v1.34.5 (x_refsource_MISC)
- https://github.com/envoyproxy/envoy/releases/tag/v1.35.1 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-54588?
- CVE-2025-54588 is a high-severity vulnerability in Envoyproxy Envoy, classified under Use After Free. CVSS score: 7.5/10. Published 2025-09-02.
- How severe is CVE-2025-54588?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-54588 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.