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CVE-2025-54588

Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults

Published: Sep 2, 2025Updated: Sep 8, 2025 Sources: CVE List NVD GHSACWE-416
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 65.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-416

Affected Products

envoyenvoyproxy
On-prem
Cloud & SaaS / api-gateway
github.com/envoyproxy/envoyGoOSS Libraries
envoyproxyoss-projectUSCloud & SaaSaka envoy proxy, envoy
gopackage-ecosystemOSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
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References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-g9vw-6pvx-7gmw
github.com
https://github.com/envoyproxy/envoy/releases/tag/v1.34.5
github.com
https://github.com/envoyproxy/envoy/releases/tag/v1.35.1
github.com
and 2 more references View all →

Timeline

Published
Sep 2, 2025
Last Updated
Sep 8, 2025

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