How severe is CVE-2012-6431?

CVE-2012-6431 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2012-6431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-6431?

CVE-2012-6431 primarily affects Sensiolabs Symfony. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-6431?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-6431 published?

CVE-2012-6431 was published on 2012-12-27 and last updated on 2026-06-16.

CVE-2012-6431

CVE-2012-6431 is a medium-severity vulnerability in Sensiolabs Symfony with a CVSS 2.0 base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Sensiolabs Symfony
Published: 2012-12-27
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2012-6431?: 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.
How severe is CVE-2012-6431?: CVE-2012-6431 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2012-6431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-6431?: CVE-2012-6431 primarily affects Sensiolabs Symfony. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-6431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-6431 published?: CVE-2012-6431 was published on 2012-12-27 and last updated on 2026-06-16.

References

http://symfony.com/blog/security-release-symfony-2-0-20-and-2-1-5-released

Affected products (20)

cpe:2.3:a:sensiolabs:symfony:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.6:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.7:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.8:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.9:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.10:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.11:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.12:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.13:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.14:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.15:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.16:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.17:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.18:*:*:*:*:*:*:*
cpe:2.3:a:sensiolabs:symfony:2.0.19:*:*:*:*:*:*:*

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