CVE & CISA-KEV Catalog

CVE-2012-4557

MEDIUMEPSS 97th pctl
5.0
CVSS v2
NVD

Description

The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.

CWE-399

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

17.47%probability of exploitation in 30 days
97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.