CVE-2021-41267 — HTTP Request Smuggling in Symfony
Severity
6.5MEDIUMNVD
EPSS
0.5%
top 35.80%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedNov 24
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 oppo…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NExploitability: 2.8 | Impact: 3.6
Affected Packages4 packages
Patches
🔴Vulnerability Details
4OSV▶
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↗2021-11-24
📋Vendor Advisories
1Debian▶
CVE-2021-41267: symfony - Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework fo...↗2021