cbcvebase.
CVE-2025-64527
published 2025-12-03

CVE-2025-64527: Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy crashes when JWT authentication is configured…

PriorityP339medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.48%
37.7th percentile
Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy crashes when 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. This is caused by a re-entry bug in the JwksFetcherImpl. When the first token's JWKS fetch fails, onJwksError() callback triggers processing of the second token, which calls fetch() again on the same fetcher object. The original callback's reset() then clears the second fetch's state (receiver_ and request_) which causes a crash when the async HTTP response arrives.

Affected

12 ranges
VendorProductVersion rangeFixed in
envoyproxyenvoy< 1.33.131.33.13
envoyproxyenvoy<= 1.33.12—
envoyproxyenvoy——
envoyproxyenvoy——
envoyproxyenvoy——
envoyproxyenvoy>= 1.34.0 < 1.34.111.34.11
envoyproxyenvoy>= 1.35.0 < 1.35.71.35.7
envoyproxyenvoy>= 1.36.0 < 1.36.31.36.3
github.comenvoyproxy_envoy>= 0 < 1.33.131.33.13
github.comenvoyproxy_envoy>= 1.34.0 < 1.34.111.34.11
github.comenvoyproxy_envoy>= 1.35.0 < 1.35.71.35.7
github.comenvoyproxy_envoy>= 1.36.0 < 1.36.31.36.3

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
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