VDB

CISA-2025-62409

CISA-2025-62409 PUBLISHED CVSS 6.6 MEDIUM

Reported by GitHub_M · Published October 16, 2025

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.

Risk Scores

CVSS 4.0
6.6
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Affected Products

VendorProductVersions
envoyproxyenvoy>= 1.36.0, < 1.36.1, >= 1.35.0, < 1.35.5, >= 1.34.0, < 1.34.9
envoyproxyenvoy>= 1.36.0, < 1.36.1, >= 1.35.0, < 1.35.5, >= 1.34.0, < 1.34.9

Timeline

  • Oct 16, 2025 CVE Published
  • Oct 16, 2025 CVE Updated

References

Open in Interactive Console →
$ Console Community · 100/wk Open console ›