{"id":"CVE-2025-62504","title":"Envoy is an open source edge and service proxy","summary":"Envoy is an open source edge and service proxy. Envoy versions earlier than 1.36.2, 1.35.6, 1.34.10, and 1.33.12 contain a use-after-free vulnerability in the Lua filter. When a Lua script executing in the response phase rewrites a respo…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-416"],"vendor":"envoyproxy","product":"envoy","affected":["envoy < 1.33.12","envoy >= 1.34.0, < 1.34.10","envoy >= 1.35.0, < 1.35.6","envoy >= 1.36.0, < 1.36.2"],"patched":["envoy 1.36.2"],"published":"2025-10-16","updated":"2026-10-09","sourceUpdated":"2026-10-09T10:10:00.193","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-62504","references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-gcxr-6vrp-wff3","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.0042,"epssPercentile":0.34322,"ingestedAt":"2026-10-09T12:53:29.107Z","slug":"CVE-2025-62504","body":"## Overview\n\nEnvoy is an open source edge and service proxy. Envoy versions earlier than 1.36.2, 1.35.6, 1.34.10, and 1.33.12 contain a use-after-free vulnerability in the Lua filter. When a Lua script executing in the response phase rewrites a response body so that its size exceeds the configured per_connection_buffer_limit_bytes (default 1MB), Envoy generates a local reply whose headers override the original response headers, leaving dangling references and causing a crash. This results in denial of service. Updating to versions 1.36.2, 1.35.6, 1.34.10, or 1.33.12 fixes the issue. Increasing per_connection_buffer_limit_bytes (and for HTTP/2 the initial_stream_window_size) or increasing per_request_buffer_limit_bytes / request_body_buffer_limit can reduce the likelihood of triggering the condition but does not correct the underlying memory safety flaw.\n\n## Affected\n\n- `envoy < 1.33.12`\n- `envoy >= 1.34.0, < 1.34.10`\n- `envoy >= 1.35.0, < 1.35.6`\n- `envoy >= 1.36.0, < 1.36.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `envoy 1.36.2`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}