CVE-2011-4539
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 15.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 2.0
- 5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
- EPSS
- 15.22% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- isc/dhcp · canonical/ubuntu linux · debian/debian linux
- Source
- cve@mitre.org
EPSS 15.2% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.htmlMailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.htmlMailing List, Third Party Advisory
- http://secunia.com/advisories/47153Third Party Advisory
- http://secunia.com/advisories/47178Third Party Advisory
- http://security.gentoo.org/glsa/glsa-201301-06.xmlThird Party Advisory
- http://www.debian.org/security/2012/dsa-2519Third Party Advisory
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:182Third Party Advisory
- http://www.securityfocus.com/bid/50971Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id?1026393Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-1309-1Third Party Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/71680Third Party Advisory, VDB Entry
- https://www.isc.org/software/dhcp/advisories/cve-2011-4539Vendor Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2011-December/070980.htmlMailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2012-January/071549.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-updates/2011-12/msg00006.htmlMailing List, Third Party Advisory
- http://secunia.com/advisories/47153Third Party Advisory
- http://secunia.com/advisories/47178Third Party Advisory
- http://security.gentoo.org/glsa/glsa-201301-06.xmlThird Party Advisory
- http://www.debian.org/security/2012/dsa-2519Third Party Advisory
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:182Third Party Advisory
- http://www.securityfocus.com/bid/50971Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id?1026393Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-1309-1Third Party Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/71680Third Party Advisory, VDB Entry
- https://www.isc.org/software/dhcp/advisories/cve-2011-4539Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.