CVE-2013-6890

NONECVSS 0.0Trending — 3 sources updated this weekWeaponized

0.0

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.

CVSS v3: —
EG Score: 0.0(none)
EPSS: 93.6%
KEV: Not listed

Published

December 23, 2013

Last Modified

April 29, 2026

References (8)

cve@mitrehttp://seclists.org/oss-sec/2013/q4/535
cve@mitrehttp://secunia.com/advisories/56239
cve@mitrehttp://www.debian.org/security/2013/dsa-2826
cve@mitrehttps://bugzilla.redhat.com/show_bug.cgi?id=1045982
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/oss-sec/2013/q4/535
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/56239
af854a3a-2127-422b-91ae-364da2661108http://www.debian.org/security/2013/dsa-2826
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1045982

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-287Improper Authentication

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:09 UTCepss_batch
2026-06-04 13:09 UTCepss_batch
2026-06-02 20:10 UTCepss_batch
2026-06-02 20:10 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 21:06 UTCEG score recompute
2026-05-28 21:06 UTCGHSA enrichment
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:41 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-38909✓ verified
First seen Dec 19, 2013
DenyHosts - 'regex.py' Remote Denial of Service
Open source ↗

Frequently asked(4)

What is CVE-2013-6890?

CVE-2013-6890 is a none vulnerability published on December 23, 2013. 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.

When was CVE-2013-6890 disclosed?

CVE-2013-6890 was first published in the National Vulnerability Database on December 23, 2013, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2013-6890 actively exploited?

CVE-2013-6890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2013-6890?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-6890, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2013-6890

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2013-6890?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (8)

Frequently asked(4)

Related CVEs(same CWE)