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CVE-2009-0362

14
FAUCET Score

CVE-2009-0362 describes a denial-of-service vulnerability in Fail2ban version 0.8.3, specifically within its filter.d/wuftpd.conf configuration. An attacker can exploit an incorrect regular expression by sending a crafted reverse-resolved DNS name, leading to forced authentication failures. This vulnerability has a CVSS score of 4.0, indicating a low severity with a network attack vector and potential for partial availability impact. There is no evidence of active exploitation, no known exploit code, and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
0.8.3CPE matchmatch criteria
cpe:2.3:a:fail2ban:fail2ban:0.8.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.0MEDIUM

AV:N/AC:L/Au:S/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Exploitability Score
8.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.30%
Probability of exploitation in next 30 days
EPSS Percentile
67.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0130 is in the 81st percentile among its peer group of 21,951 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2009-0362Important

fail2ban: remote DoS via crafted domain names

Feb 4, 2009

References

bugs.debian.org / cgi-bin/bugreport.cgi
Exploit
secunia.com / advisories/33890
Vendor Advisory
securityfocus.com / bid/33734