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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 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.

    Published:Aug 6, 2009
    Last Modified:Apr 23, 2026
    EPS:Oct 28, 2009
    EPSS Score:0.01297
    CVSS Score:5.8

    Affected Products

    Vendor
    Proftpd
    Product
    Proftpd

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-63091 (CVSS 7.1) — ProFTPD before 1.3.9c and 1.3.10rc3 contains a signed integer overflow vulnerability in the mod_sftp module's …
    CVE-2026-63090 (CVSS 8.7) — ProFTPD before 1.3.9c and 1.3.10rc3 contains a heap-based buffer overflow vulnerability in the mod_sftp module…
    CVE-2026-53994 (CVSS 7.7) — ProFTPD mod_sftp contains a heap-based buffer overflow reachable by an authenticated SFTP user. The fxp_packet…
    CVE-2026-35025 (CVSS 8.6) — ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated…
    CVE-2026-44331 (CVSS 8.1) — In ProFTPD through 1.3.9a before 7666224, a SQL injection vulnerability in sqltab_fetch_clients_cb() in contri…
    CVE-2026-42167 (CVSS 8.1) — mod_sql in ProFTPD before 1.3.9a allows remote attackers to execute arbitrary code via a username, in scenario…
    CVE-2021-47865 (CVSS 8.7) — ProFTPD 1.3.7a contains a denial of service vulnerability that allows attackers to overwhelm the server by cre…
    CVE-2010-20103 (CVSS 9.3) — A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 2…
    CVE-2024-48651 (CVSS 7.5) — In ProFTPD through 1.3.8b before cec01cc, supplemental group inheritance grants unintended access to GID 0 bec…
    CVE-2023-51713 (CVSS 7.5) — make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because o…

    References

    http://bugs.proftpd.org/show_bug.cgi?id=3275
    http://marc.info/?l=oss-security&m=125630966510672&w=2
    http://marc.info/?l=oss-security&m=125632960508211&w=2
    http://secunia.com/advisories/37131
    http://secunia.com/advisories/37219
    http://www.debian.org/security/2009/dsa-1925
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:288
    http://www.securityfocus.com/bid/36804
    https://bugzilla.redhat.com/show_bug.cgi?id=530719
    https://exchange.xforce.ibmcloud.com/vulnerabilities/53936
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00642.html
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00649.html
    http://bugs.proftpd.org/show_bug.cgi?id=3275
    http://marc.info/?l=oss-security&m=125630966510672&w=2
    http://marc.info/?l=oss-security&m=125632960508211&w=2
    http://secunia.com/advisories/37131
    http://secunia.com/advisories/37219
    http://www.debian.org/security/2009/dsa-1925
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:288
    http://www.securityfocus.com/bid/36804
    https://bugzilla.redhat.com/show_bug.cgi?id=530719
    https://exchange.xforce.ibmcloud.com/vulnerabilities/53936
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00642.html
    https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00649.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High