CVE-2012-0451

CVE-2012-0451 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 4.3. 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-94.

Key facts

• Severity: Medium (CVSS 2.0 base score 4.3)
• EPSS exploit prediction: 2% (83rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-94
• Affected product: Mozilla Firefox
• Published: 2012-03-14
• Last modified: 2026-06-16

Description

CRLF injection vulnerability in Mozilla Firefox 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 allows remote web servers to bypass intended Content Security Policy (CSP) restrictions and possibly conduct cross-site scripting (XSS) attacks via crafted HTTP headers.

Frequently asked questions

What is CVE-2012-0451?

CRLF injection vulnerability in Mozilla Firefox 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 allows remote web servers to bypass intended Content Security Policy (CSP) restrictions and possibly conduct cross-site scripting (XSS) attacks via crafted HTTP headers.

How severe is CVE-2012-0451?

CVE-2012-0451 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2012-0451 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-0451?

CVE-2012-0451 primarily affects Mozilla Firefox. In total, 140 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-0451?

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

When was CVE-2012-0451 published?

CVE-2012-0451 was published on 2012-03-14 and last updated on 2026-06-16.

References

• http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00014.html
• http://lists.opensuse.org/opensuse-updates/2012-03/msg00042.html
• http://rhn.redhat.com/errata/RHSA-2012-0387.html
• http://rhn.redhat.com/errata/RHSA-2012-0388.html
• http://secunia.com/advisories/48359
• http://secunia.com/advisories/48402
• http://secunia.com/advisories/48496
• http://secunia.com/advisories/48513
• http://secunia.com/advisories/48553
• http://secunia.com/advisories/48561
• http://secunia.com/advisories/48629
• http://secunia.com/advisories/49055
• http://www.mandriva.com/security/advisories?name=MDVSA-2012:032
• http://www.mozilla.org/security/announce/2012/mfsa2012-15.html
• http://www.securityfocus.com/bid/52463
• http://www.securitytracker.com/id?1026801
• http://www.securitytracker.com/id?1026803
• http://www.securitytracker.com/id?1026804
• http://www.ubuntu.com/usn/USN-1400-1
• http://www.ubuntu.com/usn/USN-1400-2
• http://www.ubuntu.com/usn/USN-1400-3
• http://www.ubuntu.com/usn/USN-1400-4
• http://www.ubuntu.com/usn/USN-1400-5
• https://bugzilla.mozilla.org/show_bug.cgi?id=717511
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14909

Affected products (140)

• cpe:2.3:a:mozilla:firefox:4.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta1:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta10:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta11:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta12:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta2:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta3:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta4:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta5:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta6:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta7:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta8:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0:beta9:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:4.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:5.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:6.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:6.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:6.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:7.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:8.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:9.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:10.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox_esr:10.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox_esr:10.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:5.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:6.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:6.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:6.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:7.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:7.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:8.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:9.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird:9.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:10.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:10.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:thunderbird_esr:10.0.2:*:*:*:*:*:*:*

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