Is CVE-2009-4006 in the CISA KEV catalog?

No. CVE-2009-4006 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-4006?

CVE-2009-4006 has a CVSS v2 base score of 10.0 (HIGH).

What is the EPSS score for CVE-2009-4006?

CVE-2009-4006 has an EPSS score of 82.93% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2009-4006

HIGHEPSS 100th pctl

10.0

CVSS v2

NVD

Description

Stack-based buffer overflow in the TEA decoding algorithm in RhinoSoft Serv-U FTP server 7.0.0.1, 9.0.0.5, and other versions before 9.1.0.0 allows remote attackers to execute arbitrary code via a long hexadecimal string.

CWE-119Buffer Overflow

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

82.93%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

http://secunia.com/advisories/37228
http://secunia.com/secunia_research/2009-46/
http://www.osvdb.org/60427
http://www.securityfocus.com/archive/1/507955/100/0/threaded
http://www.securityfocus.com/bid/37051
http://www.securitytracker.com/id?1023199
http://www.serv-u.com/releasenotes/
http://www.vupen.com/english/advisories/2009/3277
https://exchange.xforce.ibmcloud.com/vulnerabilities/54322
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6142

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.