CVE-2013-0238

NONECVSS 0.0Elevated

0.0

The try_parse_v4_netmask function in hostmask.c in IRCD-Hybrid before 8.0.6 does not properly validate masks, which allows remote attackers to cause a denial of service (crash) via a mask that causes a negative number to be parsed.

CVSS v3: —
EG Score: 0.0(none)
EPSS: 97.4%
KEV: Not listed

Published

February 13, 2013

Last Modified

April 29, 2026

References (24)

secalert@redhathttp://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699267
secalert@redhathttp://osvdb.org/89623
secalert@redhathttp://secunia.com/advisories/51948
secalert@redhathttp://secunia.com/advisories/52106
secalert@redhathttp://svn.ircd-hybrid.org:8000/viewcvs.cgi/ircd-hybrid/trunk/src/hostmask.c?r1=1786&r2=1785&pathrev=1786
secalert@redhathttp://www.debian.org/security/2013/dsa-2618
secalert@redhathttp://www.exploit-db.com/exploits/24951
secalert@redhathttp://www.mandriva.com/security/advisories?name=MDVSA-2013:093
secalert@redhathttp://www.openwall.com/lists/oss-security/2013/01/29/8
secalert@redhathttp://www.securityfocus.com/bid/57610
secalert@redhathttps://exchange.xforce.ibmcloud.com/vulnerabilities/81695
secalert@redhathttps://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0055
af854a3a-2127-422b-91ae-364da2661108http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699267
af854a3a-2127-422b-91ae-364da2661108http://osvdb.org/89623
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/51948

Weakness Classification(1)

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

CWE-20Improper Input Validation

Data Freshness Timeline

(refreshed 12× 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.

2026-06-06 13:45 UTCepss_batch
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2026-06-05 22:44 UTCepss_batch
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2026-05-29 13:41 UTCepss_batch
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2026-05-29 00:59 UTCEG score recompute
2026-05-29 00:59 UTCGHSA enrichment
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2026-05-27 13:38 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-24951
First seen Apr 12, 2013
ircd-hybrid 8.0.5 - Denial of Service
Open source ↗

Frequently asked(4)

What is CVE-2013-0238?

CVE-2013-0238 is a none vulnerability published on February 13, 2013. The tryparsev4_netmask function in hostmask.c in IRCD-Hybrid before 8.0.6 does not properly validate masks, which allows remote attackers to cause a denial of service (crash) via a mask that causes a negative number to be parsed.

When was CVE-2013-0238 disclosed?

CVE-2013-0238 was first published in the National Vulnerability Database on February 13, 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-2013-0238 actively exploited?

CVE-2013-0238 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2013-0238?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-0238, 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.

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CVE-2013-0238

📅 Published

🔄 Last Modified

🔗 References (24)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2013-0238?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (24)

Frequently asked(4)

Related CVEs(same CWE)