denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs…
Priority LOW 34CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-287.
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.
Why it matters now
EPSS 0.08896 95th percentileScored 2026-11-07
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
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:* | 6.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* | 7.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:* | 7.1 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:* | all versions | Vulnerable | Fedoraproject |
| cpe:2.3:a:phil_schwartz:denyhosts:2.6:*:*:*:*:*:*:* | 2.6 | Vulnerable | Phil Schwartz |
- cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:* Versions 7.1 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Fedoraproject
- cpe:2.3:a:phil_schwartz:denyhosts:2.6:*:*:*:*:*:*:* Versions 2.6 Vulnerable ·Phil Schwartz
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2013-6890
- 2026-10-03 Alias added: GHSA-f4g4-953x-f5pm
References
Sources
- CVE-2013-6890 · CVE Program
- CVE-2013-6890 · NVD
- FIRST EPSS
- GHSA-f4g4-953x-f5pm · GitHub Advisory Database · CC BY 4.0
- CVE-2013-6890 · Red Hat security data · CC BY 4.0
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