CVE-2021-41267
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.
- Affected products
- Symfony Httpkernel
- Sensiolabs Symfony
- < 5.3.12
- Fix
- Available
- CVSS 3.1
- 6.5 MEDIUM
- EPSS
- 1.2% (66th percentile)
- Weakness
- CWE-444
- NVD status
- Modified
- Published
- 2021-11-24
No indexed exploits for CVE-2021-41267 yet
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No exploit for CVE-2021-41267 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.