Is CVE-1999-1053 in the CISA KEV catalog?

No. CVE-1999-1053 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-1999-1053?

CVE-1999-1053 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-1999-1053?

CVE-1999-1053 has an EPSS score of 85.20% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-1999-1053

HIGHEPSS 100th pctl

7.5

CVSS v2

NVD

Description

guestbook.pl cleanses user-inserted SSI commands by removing text between "" separators, which allows remote attackers to execute arbitrary commands when guestbook.pl is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

85.20%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 2026-04-16.