Is CVE-2011-4858 in the CISA KEV catalog?

No. CVE-2011-4858 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4858?

CVE-2011-4858 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-4858?

CVE-2011-4858 has an EPSS score of 80.32% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2011-4858

MEDIUMEPSS 100th pctl

5.0

CVSS v2

NVD

Description

Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

CWE-399

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

80.32%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% 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.