ntpd up to 4.2.8p8 Broadcast Packet resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as problematic has been found in ntpd up to 4.2.8p8 (Network Management Software). This affects an unknown function of the component Broadcast Packet Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability.

The bug was discovered 11/21/2016. The weakness was shared 01/13/2017 by Matt with Cisco (Website). It is possible to read the advisory at nwtime.org. This vulnerability is uniquely identified as CVE-2016-7428 since 09/09/2016. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 28 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 95986 (SUSE SLES11 Security Update : ntp (SUSE-SU-2016:3193-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371402 (Cisco UCS 6200 Series Fabric Interconnects Multiple Vulnerabilities in Network Time Protocol Daemon (CSCvc23476)).

Upgrading to version 4.2.8p9 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (95986). The entries 93745, 95317, 95318 and 95320 are related to this item.





  • open-source

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Resource consumption
CWE: CWE-400 / CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 95986
Nessus Name: SUSE SLES11 Security Update : ntp (SUSE-SU-2016:3193-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800407
OpenVAS Name: NTP.org ntp Multiple Vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: ntpd 4.2.8p9


09/09/2016 🔍
11/21/2016 +73 days 🔍
11/21/2016 +0 days 🔍
12/19/2016 +28 days 🔍
12/21/2016 +2 days 🔍
01/13/2017 +23 days 🔍
01/13/2017 +0 days 🔍
01/15/2017 +2 days 🔍
10/28/2022 +2112 days 🔍


Advisory: USN-3707-2
Researcher: Matt
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-7428 (🔍)

SecurityTracker: 1037354
SecurityFocus: 94446 - NTP CVE-2016-7428 Denial of Service Vulnerability
OSVDB: - CVE-2016-7428 - NTP - Denial of Service Issue

See also: 🔍


Created: 01/15/2017 10:37 AM
Updated: 10/28/2022 04:18 PM
Changes: 01/15/2017 10:37 AM (74), 07/21/2020 04:40 PM (9), 10/28/2022 04:18 PM (4)
Complete: 🔍


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