TI-2009-00342 Aliases CVE-2009-0362 GHSA-rc77-w9xr-6vvf

filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that allows…

LOW 21CWE-287Published 2009-02-13 · Updated 2024-09-16

Key facts

Attack vector: Network
Privileges required: Low
User interaction: — Not recorded in CVSS 2.0
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · None · Partial
Fix status: No fix listed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

EPSS 0.01303 70th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:fail2ban:fail2ban:0.8.3:::::::*	0.8.3	Vulnerable	fail2ban

cpe:2.3:a:fail2ban:fail2ban:0.8.3:*:*:*:*:*:*:* Versions 0.8.3 Vulnerable ·fail2ban

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2009-0362
2026-10-03 Alias added: GHSA-rc77-w9xr-6vvf

References

Exploit 1

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

TI-2021-12417 Possible RCE vulnerability in mailing action using mailutils (mail-whois) CVSS 3.1HIGH 8.1
TI-2007-04181 fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote… CVSS 2.0MEDIUM 6.8
TI-2012-04743 server/action.py in Fail2ban before 0.8.8 does not properly handle the content of the… CVSS 2.0HIGH 7.5
TI-2013-05868 config/filter.d/cyrus-imap.conf in the cyrus-imap filter in Fail2ban before 0.8.11 allows… CVSS 2.0MEDIUM 5.0
TI-2013-05867 config/filter.d/postfix.conf in the postfix filter in Fail2ban before 0.8.11 allows… CVSS 2.0MEDIUM 5.0
TI-2013-01945 The apache-auth.conf, apache-nohome.conf, apache-noscript.conf, and apache-overflows.conf… CVSS 2.0MEDIUM 5.0

See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences