CVE-2003-0993

CVE-2003-0993 is a high-severity vulnerability in Apache Http Server with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

mod_access in Apache 1.3 before 1.3.30, when running big-endian 64-bit platforms, does not properly parse Allow/Deny rules using IP addresses without a netmask, which could allow remote attackers to bypass intended access restrictions.

Frequently asked questions

What is CVE-2003-0993?
mod_access in Apache 1.3 before 1.3.30, when running big-endian 64-bit platforms, does not properly parse Allow/Deny rules using IP addresses without a netmask, which could allow remote attackers to bypass intended access restrictions.
How severe is CVE-2003-0993?
CVE-2003-0993 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-0993 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0993?
CVE-2003-0993 primarily affects Apache Http Server. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0993?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2003-0993 published?
CVE-2003-0993 was published on 2004-03-29 and last updated on 2026-06-16.

References

Affected products (22)

More vulnerabilities in Apache Http Server

All CVEs affecting Apache Http Server →

Threat intelligence

Threat-intel indicators referencing this CVE: