CVE-2016-2517

Severity CVSS v4.0:

Pending analysis

Type:

CWE-20 Input Validation

Publication date:

30/01/2017

Last modified:

20/04/2025

Description

NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey. NOTE: this vulnerability exists because of a CVE-2016-2516 regression.

Impact

Vector 3.x

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.30 MEDIUM
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

5.30

Severity 3.x

MEDIUM

Vector 2.0

AV:N/AC:H/Au:S/C:N/I:N/A:C CVSS v2.0 Severity and Metrics:

Base Score: 4.90 MEDIUM
Vector: AV:N/AC:H/Au:S/C:N/I:N/A:C

Attack Vector (AV): Network
Attack Complexity (AC): High
Authentication (Au): Single
Confidentiality (C): None
Integrity (I): None
Availability (A): Complete

Base Score 2.0

4.90

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:ntp:ntp::p6::::::*		4.2.8 (including)
cpe:2.3:a:ntp:ntp:4.3.0:::::::*
cpe:2.3:a:ntp:ntp:4.3.1:::::::*
cpe:2.3:a:ntp:ntp:4.3.2:::::::*
cpe:2.3:a:ntp:ntp:4.3.3:::::::*
cpe:2.3:a:ntp:ntp:4.3.4:::::::*
cpe:2.3:a:ntp:ntp:4.3.5:::::::*
cpe:2.3:a:ntp:ntp:4.3.6:::::::*
cpe:2.3:a:ntp:ntp:4.3.7:::::::*
cpe:2.3:a:ntp:ntp:4.3.8:::::::*
cpe:2.3:a:ntp:ntp:4.3.9:::::::*
cpe:2.3:a:ntp:ntp:4.3.10:::::::*
cpe:2.3:a:ntp:ntp:4.3.11:::::::*
cpe:2.3:a:ntp:ntp:4.3.12:::::::*
cpe:2.3:a:ntp:ntp:4.3.13:::::::*

To consult the complete list of CPE names with products and versions, see this page

CPE	From	Up to
cpe:2.3:a:ntp:ntp::p6::::::*		4.2.8 (including)
cpe:2.3:a:ntp:ntp:4.3.0:::::::*
cpe:2.3:a:ntp:ntp:4.3.1:::::::*
cpe:2.3:a:ntp:ntp:4.3.2:::::::*
cpe:2.3:a:ntp:ntp:4.3.3:::::::*
cpe:2.3:a:ntp:ntp:4.3.4:::::::*
cpe:2.3:a:ntp:ntp:4.3.5:::::::*
cpe:2.3:a:ntp:ntp:4.3.6:::::::*
cpe:2.3:a:ntp:ntp:4.3.7:::::::*
cpe:2.3:a:ntp:ntp:4.3.8:::::::*
cpe:2.3:a:ntp:ntp:4.3.9:::::::*
cpe:2.3:a:ntp:ntp:4.3.10:::::::*
cpe:2.3:a:ntp:ntp:4.3.11:::::::*
cpe:2.3:a:ntp:ntp:4.3.12:::::::*
cpe:2.3:a:ntp:ntp:4.3.13:::::::*

CVE-2016-2517

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools