Is CVE-2009-4492 in the CISA KEV catalog?

No. CVE-2009-4492 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-4492?

CVE-2009-4492 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2009-4492?

CVE-2009-4492 has an EPSS score of 16.10% (97th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2009-4492

HIGHEPSS 97th pctl

7.5

CVSS v2

NVD

Description

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

16.10%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 2026-04-23.