Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2011-4539

Severity CVSS v4.0:
Pending analysis
Type:
CWE-20 Input Validation
Publication date:
08/12/2011
Last modified:
11/04/2025

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.

Impact

Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:isc:dhcp:4.0:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.1:-:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.1:b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.1:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:-:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:b2:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:b3:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.2:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.3:-:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.3:b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.0.3:rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1.1:b3:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1.1:rc1:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools