Is CVE-2009-0356 in the CISA KEV catalog?

No. CVE-2009-0356 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-0356?

CVE-2009-0356 has a CVSS v2 base score of 5.1 (MEDIUM).

What is the EPSS score for CVE-2009-0356?

CVE-2009-0356 has an EPSS score of 3.23% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2009-0356?

No published fix for CVE-2009-0356 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2009-0356

MEDIUMEPSS 87th pctl

5.1

CVSS v2

NVD

Description

Mozilla Firefox before 3.0.6 and SeaMonkey do not block links to the (1) about:plugins and (2) about:config URIs from .desktop files, which allows user-assisted remote attackers to bypass the Same Origin Policy and execute arbitrary code with chrome privileges via vectors involving the URL field in a Desktop Entry section of a .desktop file, related to representation of about: URIs as jar:file:// URIs. NOTE: this issue exists because of an incomplete fix for CVE-2008-4582.

CWE-59Link Following

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.23%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references15

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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 2026-04-23.