{"answers":{"affected":"5 open source packages ship an affected version, including symfony/http-kernel, symfony and symfony/symfony. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-41267 in the wild and no public exploit code.","fix":"Upgrade symfony/http-kernel to 5.3.12 or later.","what":"CVE-2021-41267 is a medium-severity vulnerability in Sensiolabs Symfony, published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-41267 and fix it if it is affected.\n\nWhat it is: CVE-2021-41267 is a medium-severity vulnerability in Sensiolabs Symfony, published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-41267 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/http-kernel (Packagist): affected from 5.2.0; fixed in 5.3.12\n- symfony/http-kernel (Packagist): affected from 5.2.0; fixed in 5.3.12\n- symfony (Bitnami): affected from 5.2.0; fixed in 5.3.12\n- symfony/symfony (Packagist): affected from 5.2.0; fixed in 5.3.12\n- symfony/symfony (Packagist): affected from 5.2.0; fixed in 5.3.12\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-2021-41267/ (Markdown: https://insights.sbomify.com/CVE-2021-41267/index.md)","id":"CVE-2021-41267","markdown":"https://insights.sbomify.com/CVE-2021-41267/index.md","name":"CVE-2021-41267","record":{"aliases":["BIT-symfony-2021-41267","GHSA-q3j3-w37x-hq2q"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Symfony HTTP Kernel","requires_auth":"none","summary":"Attackers can poison web caches by forging X-Forwarded-Prefix headers in Symfony applications, potentially serving malicious content to users.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"symfony","vendor":"sensiolabs"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Headers that are not part of the \"trusted_headers\" allowed list are ignored and protect users from \"Cache poisoning\" attacks. In Symfony 5.2, maintainers added support for the `X-Forwarded-Prefix` headers, but this header was accessible in SubRequest, even if it was not part of the \"trusted_headers\" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` header, leading to a web cache poisoning issue. Versions 5.3.12 and later have a patch to ensure that the `X-Forwarded-Prefix` header is not forwarded to subrequests when it is not trusted.","ecosystems":["Bitnami","Packagist"],"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":"Webcache Poisoning in Symfony","id":"CVE-2021-41267","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"sensiolabs:symfony","products":["sensiolabs:symfony"],"type":"other","year":"2021"},"n_packages":5,"n_references":4,"next":{"headline":"Cookie persistence in Symfony","id":"CVE-2021-41268"},"packages":[{"ecosystem":"Bitnami","fixed":["5.3.12"],"introduced":["5.2.0"],"last_affected":[],"package":"symfony","purl":"pkg:bitnami/symfony","source":"BIT-symfony-2021-41267"},{"ecosystem":"Packagist","fixed":["5.3.12"],"introduced":["5.2.0"],"last_affected":[],"package":"symfony/http-kernel","purl":null,"source":"GHSA-q3j3-w37x-hq2q"},{"ecosystem":"Packagist","fixed":["5.3.12"],"introduced":["5.2.0"],"last_affected":[],"package":"symfony/http-kernel","purl":"pkg:composer/symfony/http-kernel","source":"GHSA-q3j3-w37x-hq2q"},{"ecosystem":"Packagist","fixed":["5.3.12"],"introduced":["5.2.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-q3j3-w37x-hq2q"},{"ecosystem":"Packagist","fixed":["5.3.12"],"introduced":["5.2.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-q3j3-w37x-hq2q"}],"prev":{"headline":"Authentication bypass issue in the Operator Console","id":"CVE-2021-41266"},"products":["symfony"],"published":"2021-11-24","related":[{"cvss_score":9.8,"headline":"Improper Input Validation in Symfony","id":"CVE-2019-11325","kev_date_added":null,"published":"2019-11-21"},{"cvss_score":9.8,"headline":"Symfony Incorrect Access Control","id":"CVE-2017-11365","kev_date_added":null,"published":"2019-05-23"},{"cvss_score":9.8,"headline":"Invalid HTTP method overrides allow possible XSS or other attacks in Symfony","id":"CVE-2019-10913","kev_date_added":null,"published":"2019-05-16"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2018-11407","kev_date_added":null,"published":"2018-06-13"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2016-2403","kev_date_added":null,"published":"2017-02-07"},{"cvss_score":9.1,"headline":"Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator","id":"CVE-2026-45063","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":8.8,"headline":"Symfony: OidcTokenHandler Accepts JWTs Missing aud/iss/exp Claims","id":"CVE-2026-45069","kev_date_added":null,"published":"2026-07-14"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["symfony"]},"summary":"Attackers can poison web caches by forging X-Forwarded-Prefix headers in Symfony applications, potentially serving malicious content to users.","url":"https://insights.sbomify.com/CVE-2021-41267/"}