fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the…

Description

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.

Scores

EPSS (exploitation in 30 days)

5.7% · top 6.9% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.

Weakness

• n/a

Affected products

• n/a

  • affected n/a

References (8)

• DSA-1456 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• 23237 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 42484 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
• 25117 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• 28374 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://bugs.gentoo.org/show_bug.cgi?id=181214 (opens in a new tab)x_refsource_MISCx_transferred
• GLSA-200707-13 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• http://www.ossec.net/en/attacking-loganalysis.html (opens in a new tab)x_refsource_MISCx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2007-4321](https://trackcve.app/badge/CVE-2007-4321.svg)](https://trackcve.app/cve/CVE-2007-4321)

Record last updated 7 Aug 2024, 14:53 UTC.