CVE-2006-6301

Exp

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.

Published: 2006-12-06 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-6301 is rated High Exploit Risk (63.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.50%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2006-6301

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2006-6301

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-30 1.18% 1.50% +0.32%
2 2025-03-17 5.56% 1.18% -4.39%
3 2024-12-17 — 5.56% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-6301

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2006-6301

OS Trackers for CVE-2006-6301

vendor priority summary link
alpine — CVE-2006-6301: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-2006-6301
gentoo normal CVE-2006-6301: 1 GLSA(s) (200701-01), 1 atom(s) (app-admin/denyhosts); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2006-6301
ubuntu low CVE-2006-6301 low priority: Ubuntu including 1 source packages (denyhosts), 5 status rows across 5 suites (dapper, edgy, feisty, gutsy, upstream): released 4, DNE 1. https://ubuntu.com/security/CVE-2006-6301

Affected software / configurations for CVE-2006-6301

Vendor Product Version Raw CPE
denyhosts denyhosts 2.5 cpe:2.3:a:denyhosts:denyhosts:2.5:*:*:*:*:*:*:*

References for CVE-2006-6301

cvelogic Threat Intelligence