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CVE-2009-3639

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired...

5.8 MediumFix available

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Exploit likelihood

5.70%Up 3.5 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.8

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Record
CVE-2009-3639
CVSS 2.0
5.8 MediumAV:N/AC:M/Au:N/C:N/I:P/A:P
Weakness
CWE-310
Updated
2026-11-02
CVE List No score

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Record
CVE-2009-3639
Updated
2026-11-02
EUVDEUVD-2009-3614 No score

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Record
EUVD-2009-3614
Updated
2026-11-03
GitHub AdvisoriesGHSA-4vq9-9g4j-pgg4 No score

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired...

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Record
GHSA-4vq9-9g4j-pgg4
Updated
2026-11-02
OSV No score

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Record
CVE-2009-3639
Updated
2026-11-02
OSVDEBIAN-CVE-2009-3639 No score

The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Record
DEBIAN-CVE-2009-3639
Updated
2026-11-02
OSVopenSUSE-SU-2024:10048-1 No score

proftpd-1.3.5b-2.5 on GA media

These are all security issues fixed in the proftpd-1.3.5b-2.5 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10048-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
proftpd-dfsg
Debian:12
before 1.3.2a-2
1.3.2a-2
proftpd-dfsg
Debian:13
before 1.3.2a-2
1.3.2a-2
proftpd-dfsg
Debian:14
before 1.3.2a-2
1.3.2a-2
proftpd-dfsg
Debian:4.0
before 1.3.0-19etch3, plus listed versions
1.3.0-191.3.0-19etch11.3.0-19etch2
1.3.0-19etch3
proftpd-dfsg
Debian:5.0
before 1.3.1-17lenny4, plus listed versions
1.3.1-161.3.1-171.3.1-17lenny11.3.1-17lenny21.3.1-17lenny2~bpo40+11.3.1-17lenny31.3.1-17lenny4~bpo40+1
1.3.1-17lenny4
proftpd
openSUSE:Tumbleweed
From an advisory covering 8 CVEs
before 1.3.5b-2.5
1.3.5b-2.5

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-3639 is a medium vulnerability (CVSS 5.8) in Proftpd, published October 28, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.70%, the 93rd percentile. Fixed in proftpd-dfsg 1.3.2a-2.

References

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