CVE-2006-6301
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…
Does this matter?
Lower severity and a low EPSS score (1.88%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
- EPSS
- 1.88% probability · 79th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- denyhosts/denyhosts
- Source
- cve@mitre.org
EPSS 1.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://bugs.gentoo.org/show_bug.cgi?id=157163Exploit
- http://secunia.com/advisories/23236Vendor Advisory
- http://secunia.com/advisories/23603Vendor Advisory
- 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=157163Exploit
- http://secunia.com/advisories/23236Vendor Advisory
- http://secunia.com/advisories/23603Vendor Advisory
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.