CVE-2013-6890

MEDIUM 5.0CVE-2013-6890 · Published 23/12/2013 · updated 17/06/2026

In short

CVE-2013-6890 is a MEDIUM (CVSS 5.0) vulnerability affecting denyhosts (phil schwartz).
Chance of exploitation in the next 30 days (EPSS): 8.9%, higher than 95.3% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
denyhosts phil_schwartz	`= 2.6`	No fix yet

Description

denyhosts 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.

References

seclists.org/oss-sec/2013/q4/535
secunia.com/advisories/56239 · Vendor Advisory
debian.org/security/2013/dsa-2826
bugzilla.redhat.com/show_bug.cgi

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