CVE-2009-0774

CVE-2009-0774 is a critical-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 9.3. 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-399.

Key facts

Description

The layout engine in Mozilla Firefox 2 and 3 before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via vectors related to gczeal, a different vulnerability than CVE-2009-0773.

Frequently asked questions

What is CVE-2009-0774?
The layout engine in Mozilla Firefox 2 and 3 before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey 1.1.15 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via vectors related to gczeal, a different vulnerability than CVE-2009-0773.
How severe is CVE-2009-0774?
CVE-2009-0774 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-0774 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0774?
CVE-2009-0774 primarily affects Mozilla Firefox. In total, 88 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0774?
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-2009-0774 published?
CVE-2009-0774 was published on 2009-03-05 and last updated on 2026-06-16.

References

Affected products (88)

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