ISC dhcp up to 4.2.3 dhcpd.conf input validation

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in ISC dhcp up to 4.2.3 (Network Management Software) and classified as problematic. Affected by this issue is an unknown code of the file dhcpd.conf. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-20. Impacted is availability.

The weakness was published 12/08/2011 with BlueCat Networks (Website). The advisory is available at This vulnerability is handled as CVE-2011-4539. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 68407 (Oracle Linux 6 : dhcp (ELSA-2011-1819)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 120898 (Solaris 11 Support Repository Update (SRU) 4 Missing).

Upgrading to version 4.0.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 50971), X-Force (71680), Vulnerability Center (SBV-34004) and Tenable (68407). Similar entries are available at 4542, 4541, 4557 and 60574.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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Class: Privilege escalation
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 68407
Nessus Name: Oracle Linux 6 : dhcp (ELSA-2011-1819)
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OpenVAS ID: 71496
OpenVAS Name: Debian Security Advisory DSA 2519-1 (isc-dhcp)
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Threat Intelligenceinfoedit

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Recommended: Upgrade
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Upgrade: dhcp 4.0.3


12/07/2011 🔍
12/08/2011 +1 days 🔍
12/08/2011 +0 days 🔍
12/08/2011 +0 days 🔍
12/12/2011 +4 days 🔍
07/12/2013 +578 days 🔍
03/23/2015 +619 days 🔍
01/23/2017 +672 days 🔍
04/05/2017 +72 days 🔍



Organization: BlueCat Networks
Status: Not defined

CVE: CVE-2011-4539 (🔍)

SecurityFocus: 50971 - ISC DHCP Regular Expressions Denial of Service Vulnerability
X-Force: 71680
Vulnerability Center: 34004 - ISC DHCP 4.x before 4.2.3-P1 and 4.1-ESV before 4.1-ESV-R4 dhcpd Remote DoS Vulnerability, Medium

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Created: 03/23/2015 04:50 PM
Updated: 04/05/2017 03:05 PM
Changes: (10) vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai advisory_company_name source_oval_id source_securityfocus_date source_securityfocus_class
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