CVE catalog

CVE-2009-0362

fail2ban: CVE-2009-0362

Severity: Medium
Published: Feb 13, 2009, 1:30:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.30% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	fail2ban	sid	`1.1.1-1`	fixed
Debian	fail2ban	forky	`1.1.1-1`	fixed
Debian	fail2ban	trixie	`1.1.0-8`	fixed
Debian	fail2ban	bookworm	`1.0.2-2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	fail2ban	source	sid	`0.8.3-2sid1`	low	Not reported	[514163]
Debian	fail2ban	source	forky	`0.8.3-2sid1`	low	Not reported	[514163]
Debian	fail2ban	source	trixie	`0.8.3-2sid1`	low	Not reported	[514163]
Debian	fail2ban	source	bookworm	`0.8.3-2sid1`	low	Not reported	[514163]

[Debian bug #514163]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[fail2ban]Fixed
Details (2)
- 1.0.2-2 · all · bookworm
  Fixed · Fixed: 0.8.3-2sid1
  dsa · fail2ban · debian · bookworm; dsa · fail2ban · debian · 12
- 1.0.2-2 · all · bookworm
  Fixed · Fixed: 0.8.3-2sid1
  dsa · fail2ban · debian · bookworm; dsa · fail2ban · debian · 12

[Debian 13 (Trixie)]

[fail2ban]Fixed
Details (2)
- 1.1.0-8 · all · trixie
  Fixed · Fixed: 0.8.3-2sid1
  dsa · fail2ban · debian · 13
- 1.1.0-8 · all · trixie
  Fixed · Fixed: 0.8.3-2sid1
  dsa · fail2ban · debian · 13

Observed: Oct 23, 2026, 5:04:28 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]