CVE-2025-64527: exploitation status and patch state
CVE-2025-64527 · CVSS 6.5 MEDIUM · EPSS 1%
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.
Is CVE-2025-64527 exploited?
Not in the CISA KEV catalog.
EPSS puts exploitation in the next 30 days at 1%.
Public exploit code: none found in monitored sources.