Is CVE-2005-0399 in the CISA KEV catalog?

No. CVE-2005-0399 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2005-0399?

CVE-2005-0399 has a CVSS v2 base score of 5.1 (MEDIUM).

What is the EPSS score for CVE-2005-0399?

CVE-2005-0399 has an EPSS score of 15.12% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2005-0399

MEDIUMEPSS 96th pctl

5.1

CVSS v2

NVD

Description

Heap-based buffer overflow in GIF2.cpp in Firefox before 1.0.2, Mozilla before to 1.7.6, and Thunderbird before 1.0.2, and possibly other applications that use the same library, allows remote attackers to execute arbitrary code via a GIF image with a crafted Netscape extension 2 block and buffer size.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

15.12%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.