What’s Vulnerable › Vulnerabilities

CVE-2006-6301

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2006-12-06 · updated 2026-06-16

Description

DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.

Affected products

• Denyhosts: 2.5

References

• http://bugs.gentoo.org/show_bug.cgi?id=157163
• http://secunia.com/advisories/23236
• http://secunia.com/advisories/23603
• http://security.gentoo.org/glsa/glsa-200701-01.xml
• http://www.securityfocus.com/bid/21468
• http://www.vupen.com/english/advisories/2006/4876
• https://exchange.xforce.ibmcloud.com/vulnerabilities/30761
• http://bugs.gentoo.org/show_bug.cgi?id=157163
• http://secunia.com/advisories/23236
• http://secunia.com/advisories/23603
• http://security.gentoo.org/glsa/glsa-200701-01.xml
• http://www.securityfocus.com/bid/21468

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