CVE-2004-0492

CVE-2004-0492 is a critical-severity vulnerability in Apache Http Server with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 34% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a denial of service (process crash) and possibly execute arbitrary code via a negative Content-Length HTTP header field, which causes a large amount of data to be copied.

Frequently asked questions

What is CVE-2004-0492?
Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a denial of service (process crash) and possibly execute arbitrary code via a negative Content-Length HTTP header field, which causes a large amount of data to be copied.
How severe is CVE-2004-0492?
CVE-2004-0492 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2004-0492 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 34% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0492?
CVE-2004-0492 primarily affects Apache Http Server. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0492?
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-2004-0492 published?
CVE-2004-0492 was published on 2004-08-06 and last updated on 2026-06-16.

References

Affected products (17)

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Threat intelligence

Threat-intel indicators referencing this CVE: