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Vulnerable Software

Vulnerability Details 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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.005

EPSS Ranking 63.3%

CVSS Severity

CVSS v3 Score 6.5

CVSS v2 Score 4.3

References

Products affected by CVE-2021-41267

Sensiolabs » Symfony » Version: 5.2.0

cpe:2.3:a:sensiolabs:symfony:5.2.0
Sensiolabs » Symfony » Version: 5.2.1

cpe:2.3:a:sensiolabs:symfony:5.2.1
Sensiolabs » Symfony » Version: 5.2.2

cpe:2.3:a:sensiolabs:symfony:5.2.2
Sensiolabs » Symfony » Version: 5.2.3

cpe:2.3:a:sensiolabs:symfony:5.2.3
Sensiolabs » Symfony » Version: 5.2.4

cpe:2.3:a:sensiolabs:symfony:5.2.4
Sensiolabs » Symfony » Version: 5.2.5

cpe:2.3:a:sensiolabs:symfony:5.2.5
Sensiolabs » Symfony » Version: 5.2.6

cpe:2.3:a:sensiolabs:symfony:5.2.6
Sensiolabs » Symfony » Version: 5.2.7

cpe:2.3:a:sensiolabs:symfony:5.2.7
Sensiolabs » Symfony » Version: 5.2.8

cpe:2.3:a:sensiolabs:symfony:5.2.8
Sensiolabs » Symfony » Version: 5.2.9

cpe:2.3:a:sensiolabs:symfony:5.2.9
Sensiolabs » Symfony » Version: 5.3.0

cpe:2.3:a:sensiolabs:symfony:5.3.0
Sensiolabs » Symfony » Version: 5.3.1

cpe:2.3:a:sensiolabs:symfony:5.3.1
Sensiolabs » Symfony » Version: 5.3.10

cpe:2.3:a:sensiolabs:symfony:5.3.10
Sensiolabs » Symfony » Version: 5.3.11

cpe:2.3:a:sensiolabs:symfony:5.3.11
Sensiolabs » Symfony » Version: 5.3.2

cpe:2.3:a:sensiolabs:symfony:5.3.2
Sensiolabs » Symfony » Version: 5.3.3

cpe:2.3:a:sensiolabs:symfony:5.3.3
Sensiolabs » Symfony » Version: 5.3.4

cpe:2.3:a:sensiolabs:symfony:5.3.4
Sensiolabs » Symfony » Version: 5.3.5

cpe:2.3:a:sensiolabs:symfony:5.3.5
Sensiolabs » Symfony » Version: 5.3.6

cpe:2.3:a:sensiolabs:symfony:5.3.6
Sensiolabs » Symfony » Version: 5.3.7

cpe:2.3:a:sensiolabs:symfony:5.3.7
Sensiolabs » Symfony » Version: 5.3.8

cpe:2.3:a:sensiolabs:symfony:5.3.8
Sensiolabs » Symfony » Version: 5.3.9

cpe:2.3:a:sensiolabs:symfony:5.3.9

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Vulnerability Details CVE-2021-41267

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