Cisco IOS/IOS XE ntp Time access control

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability has been found in Cisco IOS and IOS XE (Router Operating System) (the affected version is unknown) and classified as problematic. Affected by this vulnerability is an unknown code of the component ntp. The manipulation with an unknown input leads to a access control vulnerability (Time). The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect integrity. The summary by CVE is:

The NTP implementation in Cisco IOS 15.1 and 15.5 and IOS XE 3.2 through 3.17 allows remote attackers to modify the system time via crafted packets, aka Bug ID CSCux46898.

The weakness was presented 04/20/2016 with Cisco as CSCux46898 as confirmed advisory (Website). It is possible to read the advisory at This vulnerability is known as CVE-2016-1384 since 01/03/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

A vulnerability in the ntp subsystem of Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to mobilize ntp associations. The vulnerability is due to missing authorization checks on certain ntp packets. An attacker could exploit this vulnerability by ingressing malicious packets to the ntp daemon. An exploit could allow the attacker to control the time of the affected device.

The vulnerability scanner Nessus provides a plugin with the ID 90862 (Cisco IOS XE NTP Subsystem Unauthorized Access (cisco-sa-20160419-ios)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l.

Upgrading 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 (90862). See VDB-74740, VDB-92853, VDB-141110 and VDB-143747 for similar entries.






CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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NVD Base Score: 7.5
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Name: Time
Class: Access control / Time
CWE: CWE-264

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍


Nessus ID: 90862
Nessus Name: Cisco IOS XE NTP Subsystem Unauthorized Access (cisco-sa-20160419-ios)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 103403
OpenVAS Name: Cisco IOS and Cisco IOS XE ntp Subsystem Unauthorized Access Vulnerability
OpenVAS File: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍


01/03/2016 🔍
04/19/2016 +106 days 🔍
04/19/2016 +0 days 🔍
04/20/2016 +1 days 🔍
04/20/2016 +0 days 🔍
04/21/2016 +1 days 🔍
05/03/2016 +11 days 🔍
07/26/2022 +2275 days 🔍



Advisory: CSCux46898
Organization: Cisco
Status: Confirmed

CVE: CVE-2016-1384 (🔍)

SecurityTracker: 1035622
SecurityFocus: 86685 - Cisco IOS and Cisco IOS XE Software CVE-2016-1384 Unauthorized Access Vulnerability

scip Labs:
See also: 🔍


Created: 04/21/2016 03:20 PM
Updated: 07/26/2022 12:55 PM
Changes: 04/21/2016 03:20 PM (64), 10/19/2018 08:12 AM (17), 07/26/2022 12:55 PM (4)
Complete: 🔍
Cache ID: 3:C01:40


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