{"answers":{"affected":"9 open source packages ship an affected version, including github.com/envoyproxy/envoy and envoy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-64527 in the wild and no public exploit code.","fix":"Upgrade github.com/envoyproxy/envoy to a fixed version for your release line: 1.33.13, 1.34.11, 1.35.7 or 1.36.3.","what":"CVE-2025-64527 is a medium-severity vulnerability in Envoyproxy Envoy, published on 3 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-64527 and fix it if it is affected.\n\nWhat it is: CVE-2025-64527 is a medium-severity vulnerability in Envoyproxy Envoy, published on 3 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-64527 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/envoyproxy/envoy (Go): affected all versions; fixed in 1.33.13\n- github.com/envoyproxy/envoy (Go): affected all versions; fixed in 1.33.13\n- github.com/envoyproxy/envoy (Go): affected from 1.34.0; fixed in 1.34.11\n- github.com/envoyproxy/envoy (Go): affected from 1.34.0; fixed in 1.34.11\n- github.com/envoyproxy/envoy (Go): affected from 1.35.0; fixed in 1.35.7\n- github.com/envoyproxy/envoy (Go): affected from 1.35.0; fixed in 1.35.7\n- github.com/envoyproxy/envoy (Go): affected from 1.36.0; fixed in 1.36.3\n- github.com/envoyproxy/envoy (Go): affected from 1.36.0; fixed in 1.36.3\n- envoy (Bitnami): affected all versions; fixed in 1.33.13, 1.34.11, 1.35.7, 1.36.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2025-64527/ (Markdown: https://insights.sbomify.com/CVE-2025-64527/index.md)","id":"CVE-2025-64527","markdown":"https://insights.sbomify.com/CVE-2025-64527/index.md","name":"CVE-2025-64527","record":{"aliases":["BIT-envoy-2025-64527","GHSA-mp85-7mrq-r866"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Envoy proxy","requires_auth":"low_privilege","summary":"Attackers can crash Envoy proxy by sending multiple JWT tokens when remote JWKS fetching fails, causing a null dereference in the fetcher logic.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"envoy","vendor":"envoyproxy"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"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.","ecosystems":["Bitnami","Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Envoy crashes when JWT authentication is configured with the remote JWKS fetching","id":"CVE-2025-64527","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"envoyproxy:envoy","products":["envoyproxy:envoy"],"type":"null_dereference","year":"2025"},"n_packages":9,"n_references":1,"next":{"headline":"Users are able to find users by name even when `enable_names` is off","id":"CVE-2025-64528"},"packages":[{"ecosystem":"Bitnami","fixed":["1.33.13","1.34.11","1.35.7","1.36.3"],"introduced":["0","1.34.0","1.35.0","1.36.0"],"last_affected":[],"package":"envoy","purl":"pkg:bitnami/envoy","source":"BIT-envoy-2025-64527"},{"ecosystem":"Go","fixed":["1.33.13"],"introduced":["0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.33.13"],"introduced":["0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.34.11"],"introduced":["1.34.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.34.11"],"introduced":["1.34.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.35.7"],"introduced":["1.35.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.35.7"],"introduced":["1.35.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.36.3"],"introduced":["1.36.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-mp85-7mrq-r866"},{"ecosystem":"Go","fixed":["1.36.3"],"introduced":["1.36.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-mp85-7mrq-r866"}],"prev":{"headline":"Strapi has a rate limit bypass on users-permissions plugin via attacker-controlled email keying","id":"CVE-2025-64526"},"products":["envoy"],"published":"2025-12-03","related":[{"cvss_score":10,"headline":"Trivial authentication bypass in Envoy","id":"CVE-2022-29226","kev_date_added":null,"published":"2022-06-09"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2019-18801","kev_date_added":null,"published":"2019-12-13"},{"cvss_score":9.8,"headline":"Security feature bypass in n/a","id":"CVE-2019-18802","kev_date_added":null,"published":"2019-12-13"},{"cvss_score":8.8,"headline":"Information disclosure in n/a","id":"CVE-2020-35470","kev_date_added":null,"published":"2020-12-15"},{"cvss_score":8.6,"headline":"Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata","id":"CVE-2024-23324","kev_date_added":null,"published":"2024-02-09"},{"cvss_score":8.6,"headline":"Envoy vulnerable to OAuth2 credentials exploit with permanent validity","id":"CVE-2023-35941","kev_date_added":null,"published":"2023-07-25"},{"cvss_score":8.6,"headline":"Incorrect handling of H2 GOAWAY + SETTINGS frames","id":"CVE-2021-39162","kev_date_added":null,"published":"2021-09-09"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-12-03","vendors":["envoyproxy"]},"summary":"Attackers can crash Envoy proxy by sending multiple JWT tokens when remote JWKS fetching fails, causing a null dereference in the fetcher logic.","url":"https://insights.sbomify.com/CVE-2025-64527/"}