State Issues in envoy - CVE-2025-64763
Published: December 3, 2025
Vulnerability identifier: #VU119111
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-64763
CWE-ID: CWE-371
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cloud Native Computing Foundation
Affected software:
envoy
envoy
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to a state issue related to forwarding of early CONNECT data in TCP proxy mode. A remote attacker can trigger de-synchronization of CONNECT tunnel state if a forwarding proxy upstream from Envoy responds with a non 2xx status and gain access to sensitive information.
How to mitigate CVE-2025-64763
Install updates from vendor's website.