CVE-2009-4006

CVE-2009-4006 is a critical-severity vulnerability in Solarwinds Serv-u File Server with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 83% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

• Severity: Critical (CVSS 2.0 base score 10.0)
• EPSS exploit prediction: 83% (100th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Solarwinds Serv-u File Server
• Published: 2009-11-20
• Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-4006?

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.

How severe is CVE-2009-4006?

CVE-2009-4006 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2009-4006 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 83% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4006?

CVE-2009-4006 primarily affects Solarwinds Serv-u File Server. In total, 28 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4006?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-4006 published?

CVE-2009-4006 was published on 2009-11-20 and last updated on 2026-06-16.

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

Affected products (28)

• cpe:2.3:a:solarwinds:serv-u_file_server:7.0.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.0.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.0.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.0.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.1.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.1.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.2.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.2.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.3.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.3.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.3.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:7.4.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.0.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.0.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.0.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.0.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.0.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.1.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.1.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.2.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.2.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:8.2.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:9.0.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:9.0.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:9.0.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:solarwinds:serv-u_file_server:9.1.0.0:*:*:*:*:*:*:*

More vulnerabilities in Solarwinds Serv-u File Server

• CVE-2004-2532 — Critical (CVSS 10.0): Serv-U FTP server before 5.1.0.0 has a default account and password for local administration, which allows local users…
• CVE-2004-0330 — Critical (CVSS 10.0): Buffer overflow in Serv-U ftp before 5.0.0.4 allows remote authenticated users to execute arbitrary code via a long…
• CVE-2011-4800 — Critical (CVSS 9.0): Directory traversal vulnerability in Serv-U FTP Server before 11.1.0.5 allows remote authenticated users to read and…
• CVE-2008-4501 — Critical (CVSS 9.0): Directory traversal vulnerability in the FTP server in Serv-U 7.0.0.1 through 7.3, including 7.2.0.1, allows remote…
• CVE-2004-2111 — High (CVSS 8.5): Stack-based buffer overflow in the site chmod command in Serv-U FTP Server before 4.2 allows remote attackers to…
• CVE-2009-1031 — High (CVSS 7.8): Directory traversal vulnerability in the FTP server in Rhino Software Serv-U File Server 7.0.0.1 through 7.4.0.1 allows…

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