Vulnerability Monitor

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CVE-2013-6890

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.

Security Impact Summary

CVE-2013-6890 is a security vulnerability that . Impacting 3 products from debian, from fedoraproject, from phil_schwartz organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2013, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2013-12-23T22:55:03.050

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.0 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-287

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	debian	debian_linux	6.0	Yes
Operating System	debian	debian_linux	7.0	Yes
Operating System	debian	debian_linux	7.1	Yes
Operating System	fedoraproject	fedora	*	Yes
Application	phil_schwartz	denyhosts	2.6	Yes

References

http://seclists.org/oss-sec/2013/q4/535 ([email protected])
http://secunia.com/advisories/56239 Vendor Advisory ([email protected])
http://www.debian.org/security/2013/dsa-2826 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=1045982 ([email protected])
http://seclists.org/oss-sec/2013/q4/535 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/56239 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2013/dsa-2826 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=1045982 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For debian's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.