Is CVE-2007-4039 being actively exploited?

CVE-2007-4039 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2007-4039?

CVE-2007-4039 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2007-4039

CRITICAL · CVSS 9.8EPSS 2.0%EU EUVD

Argument injection vulnerability involving Mozilla, when certain URIs are registered, allows remote attackers to conduct cross-browser scripting attacks and execute arbitrary commands via shell metacharacters in an unspecified URI, which are inserted into the command line when invoking the handling process, a similar issue to CVE-2007-3670.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-79
EPSS score: 2.0% (81th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2007-4023)
Published: July 27, 2007
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2007-4023 in the EU Vulnerability Database. Last updated in EUVD on April 3, 2025.

View on the EU Vulnerability Database

Affected products

mozilla / mozilla

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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