Input validation error in envoy - CVE-2025-64527
Published: December 3, 2025
Vulnerability identifier: #VU119110
CSH Severity: Medium
CVSS v4: 6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-64527
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input in the JwksFetcherImpl. A remote user can send a specially crafted request to the application and perform a denial of service (DoS) attack.
The vulnerability requires that JWT authentication is configured with the remote JWKS fetching, allow_missing_or_failed is enabled, multiple JWT tokens are present in the request headers and the JWKS fetch fails.
Affected software
envoy
How to mitigate CVE-2025-64527
Install updates from vendor's website.
envoy - addressed in versions 1.33.13, 1.34.11, 1.35.7, 1.36.3