CVE catalog

CVE-2021-41267

symfony: CVE-2021-41267

Severity: Low
Source: [NVD] · [CVE record]
EPSS: 1.28% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	symfony	sid	`7.4.21+dfsg-1`	not affected
Debian	symfony	forky	`7.4.21+dfsg-1`	not affected
Debian	symfony	trixie	`6.4.41+dfsg-0+deb13u1`	not affected
Debian	symfony	trixie-security	`6.4.41+dfsg-0+deb13u1`	not affected
Debian	symfony	bookworm	`5.4.53+dfsg-0+deb12u1`	not affected
Debian	symfony	bookworm-security	`5.4.53+dfsg-0+deb12u1`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	symfony	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	symfony	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	symfony	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	symfony	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[php-symfony]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-all-my-sms-notifier]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-amazon-mailer]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-amazon-sns-notifier]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-amazon-sqs-messenger]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-amqp-messenger]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-asset]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-beanstalkd-messenger]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-browser-kit]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-cache]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-clickatell-notifier]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-config]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-console]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-crowdin-translation-provider]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-css-selector]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-debug-bundle]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-dependency-injection]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-discord-notifier]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-doctrine-bridge]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
[php-symfony-doctrine-messenger]Unknown
Source package: [symfony]
Details (4)
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm
- 5.4.53+dfsg-0+deb12u1 · all · bookworm-security
  Not affected
  dsa · symfony · debian · bookworm

Next results

Observed: Oct 23, 2026, 6:02:44 PM UTC

References

[https://security-tracker.debian.org/tracker/CVE-2021-41267]

[Debian Security Tracker] · [FIRST EPSS]