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Vulnerability record · CVE-2013-0238 · published 13 February 2013

CVE-2013-0238: Ircd-hybrid improper input validation vulnerability

IIrcd Hybrid · Ircd Hybrid

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.

5.0 CVSS 2.0 Medium EPSS 10.0% · top 4.6% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
10.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
24References
16 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2013-0238), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.