Vulnerability Description
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 process termination. The vulnerability is in Envoy's Dynamic Forward Proxy implementation, occurring when a completion callback for a DNS resolution triggers new DNS resolutions or removes existing pending resolutions. This condition may occur when the following conditions are met: dynamic Forwarding Filter is enabled, the `envoy.reloadable_features.dfp_cluster_resolves_hosts` runtime flag is enabled, and the Host header is modified between the Dynamic Forwarding Filter and Router filters. This issue is resolved in versions 1.34.5 and 1.35.1. To work around this issue, set the envoy.reloadable_features.dfp_cluster_resolves_hosts runtime flag to false.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | >= 1.34.0, < 1.34.5 |
Related Weaknesses (CWE)
References
- https://github.com/envoyproxy/envoy/releases/tag/v1.34.5Release Notes
- https://github.com/envoyproxy/envoy/releases/tag/v1.35.1Release Notes
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-g9vw-6pvx-7gmwPatchVendor Advisory
FAQ
What is CVE-2025-54588?
CVE-2025-54588 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2025-54588?
CVE-2025-54588 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-54588?
Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.