Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2025-62409

Envoy is a cloud-native, open source edge and service proxy. Prior to 1.36.1, 1.35.5, 1.34.9, and 1.33.10, large requests and responses can potentially trigger TCP connection pool crashes due to flow control management in Envoy. It will happen when the connection is closing but upstream data is still coming, resulting in a buffer watermark callback nullptr reference. The vulnerability impacts TCP proxy and HTTP 1 & 2 mixed use cases based on ALPN. This vulnerability is fixed in 1.36.1, 1.35.5, 1.34.9, and 1.33.10.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 35.3%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2025-62409


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