CVE-2007-3304

CVE-2007-3304 is a medium-severity vulnerability in Apache Http Server with a CVSS 2.0 base score of 4.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

Apache httpd 1.3.37, 2.0.59, and 2.2.4 with the Prefork MPM module, allows local users to cause a denial of service by modifying the worker_score and process_score arrays to reference an arbitrary process ID, which is sent a SIGUSR1 signal from the master process, aka "SIGUSR1 killer."

Frequently asked questions

What is CVE-2007-3304?
Apache httpd 1.3.37, 2.0.59, and 2.2.4 with the Prefork MPM module, allows local users to cause a denial of service by modifying the worker_score and process_score arrays to reference an arbitrary process ID, which is sent a SIGUSR1 signal from the master process, aka "SIGUSR1 killer."
How severe is CVE-2007-3304?
CVE-2007-3304 has a CVSS 2.0 base score of 4.7, rated medium severity.
Is CVE-2007-3304 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3304?
CVE-2007-3304 primarily affects Apache Http Server. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-3304?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-3304 published?
CVE-2007-3304 was published on 2007-06-20 and last updated on 2026-06-16.

References

Affected products (8)

More vulnerabilities in Apache Http Server

All CVEs affecting Apache Http Server →

Threat intelligence

Threat-intel indicators referencing this CVE: