CVE-2011-4539

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 15.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-12-08 · updated 2026-06-16
Weakness: CWE-20

Description

dhcpd in ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 does not properly handle regular expressions in dhcpd.conf, which allows remote attackers to cause a denial of service (daemon crash) via a crafted request packet.

Affected products

Canonical Ubuntu Linux: 11.04, 11.10
Debian Linux: 6.0, 7.0
ISC DHCP: 4.0, 4.0.0, 4.0.1, 4.0.1-b1, 4.0.1-rc1, 4.0.2 (+29)

References

http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.html
http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.html
http://secunia.com/advisories/47153
http://secunia.com/advisories/47178
http://security.gentoo.org/glsa/glsa-201301-06.xml
http://www.debian.org/security/2012/dsa-2519
http://www.mandriva.com/security/advisories?name=MDVSA-2011:182
http://www.securityfocus.com/bid/50971
http://www.securitytracker.com/id?1026393
http://www.ubuntu.com/usn/USN-1309-1
https://exchange.xforce.ibmcloud.com/vulnerabilities/71680

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