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Vulnerability record · CVE-2009-4016 · published 4 February 2010

CVE-2009-4016: Ircd-hybrid vulnerability

IIrcd Hybrid · Ircd Hybrid

Integer underflow in the clean_string function in irc_string.c in (1) IRCD-hybrid 7.2.2 and 7.2.3, (2) ircd-ratbox before 2.2.9, and (3) oftc-hybrid before 1.6.8, when flatten_links is disabled, allows remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a LINKS command.

6.8 CVSS 2.0 Medium EPSS 4.0% · top 9.8% CWE-189 · CWE-189
6.8CVSS 2.0 base score
4.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

Description

Integer underflow in the clean_string function in irc_string.c in (1) IRCD-hybrid 7.2.2 and 7.2.3, (2) ircd-ratbox before 2.2.9, and (3) oftc-hybrid before 1.6.8, when flatten_links is disabled, allows remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a LINKS command.

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

Affected products

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

References

LinkTags
http://lists.ratbox.org/pipermail/ircd-ratbox/2010-January/000891.html
http://secunia.com/advisories/38210 Vendor Advisory
http://secunia.com/advisories/38381 Vendor Advisory
http://secunia.com/advisories/38382 Vendor Advisory
http://secunia.com/advisories/38383 Vendor Advisory
http://security.debian.org/pool/updates/main/i/ircd-hybrid/ircd-hybrid_7.2.2.dfsg.2-4+lenny1.diff.gz Patch
http://svn.ircd-hybrid.org:8000/viewcvs.cgi?rev=1044&view=rev
http://trac.oftc.net/projects/oftc-hybrid/browser/tags/oftc-hybrid-1.6.8/RELNOTES
http://www.debian.org/security/2010/dsa-1980 Patch
http://www.securityfocus.com/bid/37978
http://lists.ratbox.org/pipermail/ircd-ratbox/2010-January/000891.html
http://secunia.com/advisories/38210 Vendor Advisory
http://secunia.com/advisories/38381 Vendor Advisory
http://secunia.com/advisories/38382 Vendor Advisory
http://secunia.com/advisories/38383 Vendor Advisory
http://security.debian.org/pool/updates/main/i/ircd-hybrid/ircd-hybrid_7.2.2.dfsg.2-4+lenny1.diff.gz Patch
http://svn.ircd-hybrid.org:8000/viewcvs.cgi?rev=1044&view=rev
http://trac.oftc.net/projects/oftc-hybrid/browser/tags/oftc-hybrid-1.6.8/RELNOTES
http://www.debian.org/security/2010/dsa-1980 Patch
http://www.securityfocus.com/bid/37978

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Related vulnerabilities

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

5.0CVE-2013-0238Ircd-hybrid improper input validation vulnerabilityThe 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 …EPSS 10.0%5.0CVE-2012-6084Ircd-ratbox vulnerabilitymodules/m_capab.c in (1) ircd-ratbox before 3.0.8 and (2) Charybdis before 3.4.2 does not properly support capability negotiation during server hands…EPSS 3.0%5.0CVE-2010-0300Ircd-ratbox vulnerabilitycache.c in ircd-ratbox before 2.2.9 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a HELP comma…EPSS 2.2%5.0CVE-2007-2786Ircd-ratbox vulnerabilityRatbox IRC Daemon (aka ircd-ratbox) 2.2.5 and earlier allows remote attackers to cause a denial of service (resource exhaustion) by making many reque…EPSS 1.7%5.0CVE-2004-0605Ircd-hybrid vulnerabilityNon-registered IRC users using (1) ircd-hybrid 7.0.1 and earlier, (2) ircd-ratbox 1.5.1 and earlier, or (3) ircd-ratbox 2.0rc6 and earlier do not hav…EPSS 7.3%8.4CVE-2013-2094Linux Kernel perf_swevent_init Integer Type Flaw Enables Local Privilege EscalationThe perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, allowing a local user to…KEVEPSS 48%analysed

Source: NIST National Vulnerability Database (record CVE-2009-4016), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.