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CVE-2012-6431

22
FAUCET Score

CVE-2012-6431 describes a vulnerability in Symfony 2.0.x versions prior to 2.0.20, where inconsistent processing of URL-encoded data within its Routing and Security components allows remote attackers to bypass URI restrictions using doubly encoded strings. With a CVSS score of 6.4 (medium severity), this vulnerability is easily exploitable over the network with low attack complexity and no authentication required, potentially leading to partial confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.0.0CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:2.0.0:*:*:*:*:*:*:*
2.0.1CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:2.0.1:*:*:*:*:*:*:*
2.0.2CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:2.0.2:*:*:*:*:*:*:*
2.0.3CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:2.0.3:*:*:*:*:*:*:*
2.0.4CPE matchmatch criteria
cpe:2.3:a:sensiolabs:symfony:2.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.4MEDIUM

AV:N/AC:L/Au:N/C:P/I:P/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.88%
Probability of exploitation in next 30 days
EPSS Percentile
77.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0188 is in the 65th percentile among its peer group of 23,684 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

composerpatch availablevia ghsa
Product: symfony/http-foundationFixed in: 2.0.19
composerpatch availablevia ghsa
Product: symfony/routingFixed in: 2.0.19
composerpatch availablevia ghsa
Product: symfony/securityFixed in: 2.0.19
composerpatch availablevia ghsa
Product: symfony/symfonyFixed in: 2.0.19

Vendor Advisories (1)

composerGHSA-83c3-qx27-2rwrmedium

Symfony Allows URI Restrictions Bypass Via Double-Encoded String

May 17, 2022

References

symfony.com / blog/security-release-symfony-2-0-20-and-2-1-5-released
Vendor Advisory