CVE-2007-4039: Argument injection vulnerability involving Mozilla, when certain URIs are registered, allows remote attackers

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CRITICAL 9.8REMOTEMITIGATE

CVE-2007-4039 is a critical-severity flaw (CVSS 9.8) affecting mozilla. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-79
Published	2007-07-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mozilla

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-07-27 22:30 UTCPublished CVE record published
2026-06-16 22:43 UTCUpdated Record last modified

mozilla mozilla MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mozilla || rpm -q mozilla || mozilla --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2007-4039?

mozilla: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2007-4039 being exploited?

CVE-2007-4039 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2007-4039 affect?

CVE-2007-4039 affects mozilla. Severity is critical (CVSS 9.8). 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 ar

How urgent is CVE-2007-4039?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

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References

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