CVE-2012-1951

CVE-2012-1951 is a critical-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 10.0. 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-399.

Key facts

Description

Use-after-free vulnerability in the nsSMILTimeValueSpec::IsEventBased function in Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 13.0, Thunderbird ESR 10.x before 10.0.6, and SeaMonkey before 2.11 allows remote attackers to cause a denial of service (heap memory corruption) or possibly execute arbitrary code by interacting with objects used for SMIL Timing.

Frequently asked questions

What is CVE-2012-1951?
Use-after-free vulnerability in the nsSMILTimeValueSpec::IsEventBased function in Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 13.0, Thunderbird ESR 10.x before 10.0.6, and SeaMonkey before 2.11 allows remote attackers to cause a denial of service (heap memory corruption) or possibly execute arbitrary code by interacting with objects used for SMIL Timing.
How severe is CVE-2012-1951?
CVE-2012-1951 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2012-1951 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-1951?
CVE-2012-1951 primarily affects Mozilla Firefox. In total, 127 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-1951?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2012-1951 published?
CVE-2012-1951 was published on 2012-07-18 and last updated on 2026-06-16.

References

Affected products (127)

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