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Vulnerability Details : 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.
Publish Date : 2011-12-08 Last Update Date : 2017-08-28
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service

- Additional Vendor Supplied Data

Vendor Impact CVSS Score CVSS Vector Report Date Publish Date
Redhat moderate
AV:N/AC:M/Au:N/C:N/I:N/A:P 2011-12-07 2011-12-07
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- Related OVAL Definitions

Title Definition Id Class Family
CVE-2011-4539 unix
DEPRECATED: ELSA-2011-1819 -- dhcp security update (moderate) oval:org.mitre.oval:def:27859 unix
DSA-2519-1 isc-dhcp - denial of service oval:org.mitre.oval:def:18587 unix
DSA-2519-2 isc-dhcp - denial of service oval:org.mitre.oval:def:18067 unix
ELSA-2011:1819: dhcp security update (Moderate) oval:org.mitre.oval:def:23611 unix
RHSA-2011:1819: dhcp security update (Moderate) oval:org.mitre.oval:def:22104 unix
RHSA-2011:1819: dhcp security update (Moderate) oval:com.redhat.rhsa:def:20111819 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2011-4539

# Product Type Vendor Product Version Update Edition Language
1 Application ISC Dhcp 4.0 Version Details Vulnerabilities
2 Application ISC Dhcp 4.0.0 Version Details Vulnerabilities
3 Application ISC Dhcp 4.0.1 RC1 Version Details Vulnerabilities
4 Application ISC Dhcp 4.0.1 Version Details Vulnerabilities
5 Application ISC Dhcp 4.0.1 B1 Version Details Vulnerabilities
6 Application ISC Dhcp 4.0.2 Version Details Vulnerabilities
7 Application ISC Dhcp 4.0.2 B1 Version Details Vulnerabilities
8 Application ISC Dhcp 4.0.2 B2 Version Details Vulnerabilities
9 Application ISC Dhcp 4.0.2 B3 Version Details Vulnerabilities
10 Application ISC Dhcp 4.0.2 RC1 Version Details Vulnerabilities
11 Application ISC Dhcp 4.0.3 Version Details Vulnerabilities
12 Application ISC Dhcp 4.0.3 B1 Version Details Vulnerabilities
13 Application ISC Dhcp 4.0.3 RC1 Version Details Vulnerabilities
14 Application ISC Dhcp 4.1-esv R3 Version Details Vulnerabilities
15 Application ISC Dhcp 4.1-esv R3 B1 Version Details Vulnerabilities
16 Application ISC Dhcp 4.1-esv R2 Version Details Vulnerabilities
17 Application ISC Dhcp 4.1-esv R1 Version Details Vulnerabilities
18 Application ISC Dhcp 4.1-esv Version Details Vulnerabilities
19 Application ISC Dhcp 4.1.1 B3 Version Details Vulnerabilities
20 Application ISC Dhcp 4.1.1 RC1 Version Details Vulnerabilities
21 Application ISC Dhcp 4.1.2 Version Details Vulnerabilities
22 Application ISC Dhcp 4.2.0 B2 Version Details Vulnerabilities
23 Application ISC Dhcp 4.2.0 P1 Version Details Vulnerabilities
24 Application ISC Dhcp 4.2.0 Version Details Vulnerabilities
25 Application ISC Dhcp 4.2.0 RC1 Version Details Vulnerabilities
26 Application ISC Dhcp 4.2.0 A1 Version Details Vulnerabilities
27 Application ISC Dhcp 4.2.0 A2 Version Details Vulnerabilities
28 Application ISC Dhcp 4.2.0 B1 Version Details Vulnerabilities
29 Application ISC Dhcp 4.2.1 Version Details Vulnerabilities
30 Application ISC Dhcp 4.2.1 B1 Version Details Vulnerabilities
31 Application ISC Dhcp 4.2.1 RC1 Version Details Vulnerabilities
32 Application ISC Dhcp 4.2.2 B1 Version Details Vulnerabilities
33 Application ISC Dhcp 4.2.2 Version Details Vulnerabilities
34 Application ISC Dhcp 4.2.2 RC1 Version Details Vulnerabilities
35 Application ISC Dhcp 4.2.3 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
ISC Dhcp 35

- References For CVE-2011-4539
BID 50971 ISC DHCP Regular Expressions Denial of Service Vulnerability Release Date:2013-01-09
XF isc-dhcp-dhcpd-regex-dos(71680)
GENTOO GLSA-201301-06
FEDORA FEDORA-2011-16976
SUSE openSUSE-SU-2011:1318
FEDORA FEDORA-2011-16981

- Metasploit Modules Related To CVE-2011-4539

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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