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    CVE-2007-4321

    fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6302.

    Published:Aug 14, 2007
    Last Modified:Apr 23, 2026
    EPS:Aug 14, 2007
    EPSS Score:0.12111
    CVSS Score:6.8

    Affected Products

    Vendor
    Fail2ban
    Product
    Fail2ban

    Exploits

    https://www.exploit-db.com/exploits/30430

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    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-2009-0362 (CVSS 4) — filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that allows remote attackers to ca…
    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