CVE-2013-0238

CVE-2013-0238 is a medium-severity vulnerability in Ircd-hybrid with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 10% (95th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: Ircd-hybrid
• Published: 2013-02-13
• Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2013-0238?

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.

How severe is CVE-2013-0238?

CVE-2013-0238 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2013-0238 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-0238?

CVE-2013-0238 primarily affects Ircd-hybrid. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-0238?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-0238 published?

CVE-2013-0238 was published on 2013-02-13 and last updated on 2026-06-16.

References

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699267
• http://osvdb.org/89623
• http://secunia.com/advisories/51948
• http://secunia.com/advisories/52106
• 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

Affected products (17)

• cpe:2.3:a:ircd-hybrid:ircd-hybrid:*:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.3.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:7.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:beta1:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:beta2:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:beta3:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:ircd-hybrid:ircd-hybrid:8.0.4:*:*:*:*:*:*:*

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