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CVE-2013-6890

MediumPublished

denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect...

Published: Dec 23, 2013
Updated: Aug 6, 2024
Assigning CNA: mitre
Evidence observed: Dec 19, 2013

Primary CVSS

5.0/ 10Medium

nvd · CVSS 2.0

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

EPSS probability estimate

8.9%

Low · next 30 days

Percentile: 95.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

DenyHosts - 'regex.py' Remote Denial of ServiceExploit
Helmut Grohne · linux · Dec 19, 2013

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