How severe is CVE-2004-0493?

No CVSS score has been assigned to CVE-2004-0493 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2004-0493?

Affected package information for CVE-2004-0493 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2004-0493?

No fixed version has been published for CVE-2004-0493 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2004-0493 actively exploited in the wild?

Yes. There are 3 known exploit references for CVE-2004-0493, including 2 documented proof-of-concept exploits on Exploit-DB and 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2004-0493?

CVE-2004-0493 has an EPSS (Exploit Prediction Scoring System) score of 90.5%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2004-0493 published, and has it been updated?

CVE-2004-0493 was published on August 6, 2004 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2004-0493

Published

Aug 6, 2004

Updated

Apr 10, 2026

Affected

0 pkgs

Patched

None yet

Exploits

3 known

EPSS Exploitation Probability

via FIRST.org ↗

90.5%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

The ap_get_mime_headers_core function in Apache httpd 2.0.49 allows remote attackers to cause a denial of service (memory exhaustion), and possibly an integer signedness error leading to a heap-based buffer overflow on 64 bit systems, via long header lines with large numbers of space or tab characters.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-360dosmultiple✓ Verified

Apache - Arbitrary Long HTTP Headers (Denial of Service)

by bkbll · Jul 22, 2004

Exploit-DB Source

EDB-371doslinux✓ Verified

Apache - Arbitrary Long HTTP Headers Denial of Service

by anonymous · Aug 2, 2004

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2004-0493 in your stack?

O3 detects CVE-2004-0493 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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