{"answers":{"affected":"9 open source packages ship an affected version, including github.com/envoyproxy/envoy and envoy. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66220 exists.","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-2025-66220 is a medium-severity vulnerability in Envoyproxy Envoy, published on 3 Dec 2025. An attacker needs administrator access to exploit it, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-66220 and fix it if it is affected.\n\nWhat it is: CVE-2025-66220 is a medium-severity vulnerability in Envoyproxy Envoy, published on 3 Dec 2025. An attacker needs administrator access to exploit it, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66220 exists.\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-2025-66220/ (Markdown: https://insights.sbomify.com/CVE-2025-66220/index.md)","id":"CVE-2025-66220","markdown":"https://insights.sbomify.com/CVE-2025-66220/index.md","name":"CVE-2025-66220","record":{"aliases":["BIT-envoy-2025-66220","GHSA-rwjg-c3h2-f57p"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Envoy proxy","requires_auth":"high_privilege","summary":"Attackers can bypass mTLS authentication by using certificates with embedded null bytes in SAN values, allowing unauthorized access to protected services.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"envoy","vendor":"envoyproxy"}],"cvss":{"score":5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-170","name":"Improper Null Termination"}],"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’s mTLS certificate matcher for match_typed_subject_alt_names may incorrectly treat certificates containing an embedded null byte (\\0) inside an OTHERNAME SAN value as valid matches.","ecosystems":["Bitnami","Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Envoy's TLS certificate matcher for `match_typed_subject_alt_names` may incorrectly treat certificates containing an embedded null byte","id":"CVE-2025-66220","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"envoyproxy:envoy","products":["envoyproxy:envoy"],"type":"security_feature_bypass","year":"2025"},"n_packages":9,"n_references":1,"next":{"headline":"Werkzeug safe_join() allows Windows special device names","id":"CVE-2025-66221"},"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-2025-66220"},{"ecosystem":"Go","fixed":["1.33.13"],"introduced":["0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-rwjg-c3h2-f57p"},{"ecosystem":"Go","fixed":["1.33.13"],"introduced":["0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":"pkg:golang/github.com/envoyproxy/envoy","source":"GHSA-rwjg-c3h2-f57p"},{"ecosystem":"Go","fixed":["1.34.11"],"introduced":["1.34.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-rwjg-c3h2-f57p"},{"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-rwjg-c3h2-f57p"},{"ecosystem":"Go","fixed":["1.35.7"],"introduced":["1.35.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-rwjg-c3h2-f57p"},{"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-rwjg-c3h2-f57p"},{"ecosystem":"Go","fixed":["1.36.3"],"introduced":["1.36.0"],"last_affected":[],"package":"github.com/envoyproxy/envoy","purl":null,"source":"GHSA-rwjg-c3h2-f57p"},{"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-rwjg-c3h2-f57p"}],"prev":{"headline":"willitmerge has a command Injection vulnerability","id":"CVE-2025-66219"},"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-12-03","vendors":["envoyproxy"]},"summary":"Attackers can bypass mTLS authentication by using certificates with embedded null bytes in SAN values, allowing unauthorized access to protected services.","url":"https://insights.sbomify.com/CVE-2025-66220/"}