DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to…
Priority LOW 27Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.0189 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2006-6301
- 2026-10-03 Alias added: GHSA-6xhr-5mv6-f4jf
References
More Denyhosts vulnerabilities
- TI-2007-04183 DenyHosts 2.6 does not properly parse sshd log files, which allows remote attackers to… CVSS 2.0MEDIUM 6.8
- TI-2007-05488 DenyHosts 2.6 processes OpenSSH sshd "not listed in AllowUsers" log messages with an… CVSS 2.0MEDIUM 4.3
Sources
- CVE-2006-6301 · CVE Program
- CVE-2006-6301 · NVD
- FIRST EPSS
- GHSA-6xhr-5mv6-f4jf · GitHub Advisory Database · CC BY 4.0
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