Is CVE-2013-4559 in the CISA KEV catalog?

No. CVE-2013-4559 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2013-4559?

CVE-2013-4559 has a CVSS v2 base score of 7.6 (HIGH).

What is the EPSS score for CVE-2013-4559?

CVE-2013-4559 has an EPSS score of 10.72% (95th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2013-4559

HIGHEPSS 95th pctl

7.6

CVSS v2

NVD

Description

lighttpd before 1.4.33 does not check the return value of the (1) setuid, (2) setgid, or (3) setgroups functions, which might cause lighttpd to run as root if it is restarted and allows remote attackers to gain privileges, as demonstrated by multiple calls to the clone function that cause setuid to fail when the user process limit is reached.

CWE-264

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

10.72%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% 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.