CVE-2012-6431 json
Symfony Allows URI Restrictions Bypass Via Double-Encoded String
published 2012-12-27 13 y ago modified 2026-06-16 4 mo ago also GHSA-83c3-qx27-2rwr , EUVD-2022-3093
- cvss
- 6.4
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
Symfony 2.0.x before 2.0.20 does not process URL encoded data consistently within the Routing and Security components, which allows remote attackers to bypass intended URI restrictions via a doubly encoded string.
Patch / fix
- packagist symfony/http-foundation 2.0.19
- packagist symfony/routing 2.0.19
- packagist symfony/security 2.0.19
- packagist symfony/symfony 2.0.19
Exploit prediction
1.88% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/http-foundation | >=2.0.0, <2.0.19 |
2.0.19 |
| packagist | symfony/routing | >=2.0.0, <2.0.19 |
2.0.19 |
| packagist | symfony/security | >=2.0.0, <2.0.19 |
2.0.19 |
| packagist | symfony/symfony | >=2.0.0, <2.0.19 |
2.0.19 |
Classification
References
-
github.com
/symfony/symfony/commit/55014a6841bec50046e8329a4835c160ac31a496
web
-
github.com
/symfony/symfony/commit/8b2c17f80377582287a78e0b521497e039dd6b0d
web
-
symfony.com
/blog/security-release-symfony-2-0-20-and-2-1-5-released
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2012-6431
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2012-6431.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/routing/CVE-2012-6431.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2012-6431.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2012-6431.yaml
web
-
symfony.com
/blog/security-release-symfony-2-0-20-and-2-1-5-released
web
Sources
- CVE List CVE-2012-6431
- GitHub Advisory GHSA-83c3-qx27-2rwr
- NVD CVE-2012-6431
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