CVE-2013-6890

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Summary

CVECVE-2013-6890
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2013-12-23 22:55:03 UTC
Updated2026-04-29 01:13:23 UTC
Descriptiondenyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.

Risk And Classification

Primary CVSS: v2.0 5 from [email protected]

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

EPSS: 0.088960000 probability, percentile 0.946800000 (date 2026-07-22)

Problem Types: CWE-287 | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 6.0 All All All
Operating System Debian Debian Linux 7.0 All All All
Operating System Debian Debian Linux 7.1 All All All
Operating System Fedoraproject Fedora All All All All
Application Phil Schwartz Denyhosts 2.6 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Security Advisory SA56239 - Debian update for denyhosts - Secunia af854a3a-2127-422b-91ae-364da2661108 secunia.com Vendor Advisory
oss-sec: Re: [SECURITY] [DSA 2826-1] denyhosts security update af854a3a-2127-422b-91ae-364da2661108 seclists.org
Debian -- Security Information -- DSA-2826-1 denyhosts af854a3a-2127-422b-91ae-364da2661108 www.debian.org
1045982 – (CVE-2013-6890) CVE-2013-6890 denyhosts: remote denial of ssh service af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com
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