How severe is CVE-2007-4039?

CVE-2007-4039 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2007-4039 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4039?

CVE-2007-4039 affects Mozilla. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-4039?

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-2007-4039 published?

CVE-2007-4039 was published on 2007-07-27 and last updated on 2026-06-16.

CVE-2007-4039

CVE-2007-4039 is a critical-severity vulnerability in Mozilla with a CVSS 3.x base score of 9.8. 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-79.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 4.3
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mozilla
Published: 2007-07-27
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2007-4039?: 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.
How severe is CVE-2007-4039?: CVE-2007-4039 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2007-4039 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4039?: CVE-2007-4039 affects Mozilla. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-4039?: 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-2007-4039 published?: CVE-2007-4039 was published on 2007-07-27 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mozilla:mozilla:*:*:*:*:*:*:*:*

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