ntp 4.2.8p5 ntpdc null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in ntp 4.2.8p5 (Network Management Software). It has been rated as problematic. Affected by this issue is an unknown functionality of the component ntpdc. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is integrity, and availability. CVE summarizes:

ntpd in NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to cause a denial of service (NULL pointer dereference) via a ntpdc reslist command.

The weakness was presented 01/19/2016 as confirmed security notice (Website). The advisory is shared for download at support.ntp.org. This vulnerability is handled as CVE-2015-7977 since 10/23/2015. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 88054 (Network Time Protocol Daemon (ntpd) 3.x / 4.x < 4.2.8p6 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157189 (Oracle Enterprise Linux Security Update for ntp (ELSA-2016-0780)).

Upgrading to version 4.2.8p6 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (110022) and Tenable (88054).






CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.2
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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Nessus ID: 88054
Nessus Name: Network Time Protocol Daemon (ntpd) 3.x / 4.x < 4.2.8p6 Multiple Vulnerabilities
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OpenVAS ID: 900567
OpenVAS Name: Fedora Update for ntp FEDORA-2016-8
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Recommended: Upgrade
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Upgrade: ntp 4.2.8p6


10/23/2015 🔍
01/19/2016 +88 days 🔍
01/19/2016 +0 days 🔍
01/19/2016 +0 days 🔍
01/21/2016 +2 days 🔍
01/25/2016 +4 days 🔍
01/26/2016 +1 days 🔍
01/29/2016 +3 days 🔍
01/30/2017 +367 days 🔍
07/06/2022 +1983 days 🔍


Advisory: USN-3096-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7977 (🔍)

X-Force: 110022 - NTP ntpdc reslist command denial of service
SecurityTracker: 1034782
Vulnerability Center: 56273 - [cisco-sa-20160127-ntpd] Cisco Multiple Products Remote DoS and Security Bypass due to an Issue in NTP Server - CVE-2015-7977, High
SecurityFocus: 81815 - NTP CVE-2015-7977 NULL Pointer Dereference Denial of Service Vulnerability


Created: 01/25/2016 01:49 PM
Updated: 07/06/2022 08:46 AM
Changes: 01/25/2016 01:49 PM (71), 07/22/2018 10:23 AM (18), 07/06/2022 08:43 AM (4), 07/06/2022 08:46 AM (1)
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Cache ID: 44:342:40


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