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    CVE-2009-0362

    filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that allows remote attackers to cause a denial of service (forced authentication failures) via a crafted reverse-resolved DNS name (rhost) entry that contains a substring that is interpreted as an IP address, a different vulnerability than CVE-2007-4321.

    Published:Feb 4, 2009
    Last Modified:Apr 23, 2026
    EPS:Feb 13, 2009
    EPSS Score:0.00589
    CVSS Score:4

    Affected Products

    Vendor
    Fail2ban
    Product
    Fail2ban

    Exploits

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=514163http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=514163

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2025-45311 (CVSS 8.8) — Insecure permissions in fail2ban-client v0.11.2 allows attackers with limited sudo privileges to perform arbit…
    CVE-2021-32749 (CVSS 6.1) — fail2ban is a daemon to ban hosts that cause multiple authentication errors. In versions 0.9.7 and prior, 0.10…
    CVE-2009-5023 (CVSS 4.7) — The (1) dshield.conf, (2) mail-buffered.conf, (3) mynetwatchman.conf, and (4) mynetwatchman.conf actions in ac…
    CVE-2013-7177 (CVSS 5) — config/filter.d/cyrus-imap.conf in the cyrus-imap filter in Fail2ban before 0.8.11 allows remote attackers to …
    CVE-2013-7176 (CVSS 5) — config/filter.d/postfix.conf in the postfix filter in Fail2ban before 0.8.11 allows remote attackers to trigge…
    CVE-2013-2178 (CVSS 5) — The apache-auth.conf, apache-nohome.conf, apache-noscript.conf, and apache-overflows.conf files in Fail2ban be…
    CVE-2012-5642 (CVSS 7.5) — server/action.py in Fail2ban before 0.8.8 does not properly handle the content of the matches tag, which might…
    CVE-2007-4321 (CVSS 6.8) — fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrar…
    CVE-2006-6302 (CVSS 5) — fail2ban 0.7.4 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitr…

    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