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CVE-2025-54588— Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.34.0至1.34.4版本和1.35.0版本存在资源管理错误漏洞，该漏洞源于DNS缓存中存在释放后重用，可能导致进程异常终止。

CVSS 7.5 · High EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-54588

Vulnerability Information
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Vulnerability Title
Envoy: Race condition in Dynamic Forward Proxy leads to use-after-free and segmentation faults
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.34.0至1.34.4版本和1.35.0版本存在资源管理错误漏洞，该漏洞源于DNS缓存中存在释放后重用，可能导致进程异常终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.34.0, < 1.34.5 -

II. Public POCs for CVE-2025-54588

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III. Intelligence Information for CVE-2025-54588

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IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-416

V. Comments for CVE-2025-54588

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