Home / CVE DB / CVE-2016-4955
Standard
Vulnerability Identifier

CVE-2016-4955

2016-07-05
Severity Assessment
5.9
MEDIUM
CVSS v3.x Score
Clinical Analysis (Description)

ntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

Vector Sequencing

Attack Parameters

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Impact Consequences

Technical Impact

Unchanged
Scope
None
Confidentiality
None
Integrity
High
Availability
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v2 Score (Legacy)
4.3

For backward compatibility

EPSS Probability
1.90%

Percentile: 83.3%

Weakness Classification

CWE-CWE-362

Affected Population

Affected Configurations

Total: 110 detected entries

Software List Scrollable
nt
ntp
Vendor: ntp • v4.3.78
nt
ntp
Vendor: ntp • v4.3.75
op
opensuse
Vendor: opensuse • v13.2
nt
ntp
Vendor: ntp • v4.3.70
nt
ntp
Vendor: ntp • v4.3.6
nt
ntp
Vendor: ntp • v4.3.44
nt
ntp
Vendor: ntp • v4.2.8
nt
ntp
Vendor: ntp • v4.3.26
nt
ntp
Vendor: ntp • v4.3.60
nt
ntp
Vendor: ntp • v4.3.92
nt
ntp
Vendor: ntp • v4.3.47
nt
ntp
Vendor: ntp • v4.3.35
nt
ntp
Vendor: ntp • v4.3.37
nt
ntp
Vendor: ntp • v4.2.6
nt
ntp
Vendor: ntp • v4.3.58
nt
ntp
Vendor: ntp • v4.3.90
nt
ntp
Vendor: ntp • v4.3.32
nt
ntp
Vendor: ntp • v4.3.22
nt
ntp
Vendor: ntp • v4.3.88
nt
ntp
Vendor: ntp • v4.3.15
nt
ntp
Vendor: ntp • v4.3.76
nt
ntp
Vendor: ntp • v4.3.77
nt
ntp
Vendor: ntp • v4.3.62
nt
ntp
Vendor: ntp • v4.3.38
nt
ntp
Vendor: ntp • v4.3.57
nt
ntp
Vendor: ntp • v4.3.7
nt
ntp
Vendor: ntp • v4.2.5
nt
ntp
Vendor: ntp • v4.3.40
nt
ntp
Vendor: ntp • v4.3.73
nt
ntp
Vendor: ntp • v4.3.46
or
solaris
Vendor: oracle • v11.3
op
leap
Vendor: opensuse • v42.1
nt
ntp
Vendor: ntp • v4.3.61
nt
ntp
Vendor: ntp • v4.3.4
nt
ntp
Vendor: ntp • v4.3.72
nt
ntp
Vendor: ntp • v4.3.8
nt
ntp
Vendor: ntp • v4.3.52
nt
ntp
Vendor: ntp • v4.2.2
nt
ntp
Vendor: ntp • v4.3.17
nt
ntp
Vendor: ntp • v4.3.66
su
openstack_cloud
Vendor: suse • v5
nt
ntp
Vendor: ntp • v4.3.64
nt
ntp
Vendor: ntp • v4.3.24
nt
ntp
Vendor: ntp • v4.3.3
nt
ntp
Vendor: ntp • v4.3.48
nt
ntp
Vendor: ntp • v4.3.85
nt
ntp
Vendor: ntp • v4.3.84
nt
ntp
Vendor: ntp • v4.3.89
nt
ntp
Vendor: ntp • v4.3.0
nt
ntp
Vendor: ntp • v4.3.27
nt
ntp
Vendor: ntp • v4.3.19
nt
ntp
Vendor: ntp • v4.3.45
nt
ntp
Vendor: ntp • v4.3.67
nt
ntp
Vendor: ntp • v4.3.16
nt
ntp
Vendor: ntp • v4.3.80
no
suse_manager
Vendor: novell • v2.1
nt
ntp
Vendor: ntp • v4.3.2
nt
ntp
Vendor: ntp • v4.3.79
nt
ntp
Vendor: ntp • v4.2.4
nt
ntp
Vendor: ntp • v4.3.18
nt
ntp
Vendor: ntp • v4.2.7
nt
ntp
Vendor: ntp • v4.3.51
nt
ntp
Vendor: ntp • v4.3.56
nt
ntp
Vendor: ntp • v4.3.34
nt
ntp
Vendor: ntp • v4.3.69
nt
ntp
Vendor: ntp • v4.3.28
su
manager_proxy
Vendor: suse • v2.1
nt
ntp
Vendor: ntp • v4.3.59
nt
ntp
Vendor: ntp • v4.3.71
nt
ntp
Vendor: ntp • v4.3.10
nt
ntp
Vendor: ntp • v4.3.20
nt
ntp
Vendor: ntp • v4.3.81
nt
ntp
Vendor: ntp • v4.3.74
nt
ntp
Vendor: ntp • v4.3.83
nt
ntp
Vendor: ntp • v4.3.65
nt
ntp
Vendor: ntp • v4.3.14
su
linux_enterprise_server
Vendor: suse • v12
nt
ntp
Vendor: ntp • v4.3.43
nt
ntp
Vendor: ntp • v4.3.49
nt
ntp
Vendor: ntp • v4.3.12
nt
ntp
Vendor: ntp • v4.3.50
nt
ntp
Vendor: ntp • v4.3.1
su
linux_enterprise_server
Vendor: suse • v11
nt
ntp
Vendor: ntp • v4.3.82
nt
ntp
Vendor: ntp • v4.3.13
nt
ntp
Vendor: ntp • v4.3.9
nt
ntp
Vendor: ntp • v4.3.5
nt
ntp
Vendor: ntp • v4.3.86
nt
ntp
Vendor: ntp • v4.2.0
nt
ntp
Vendor: ntp • v4.3.41
nt
ntp
Vendor: ntp • v4.3.30
nt
ntp
Vendor: ntp • v4.3.36
nt
ntp
Vendor: ntp • v4.3.11
su
linux_enterprise_desktop
Vendor: suse • v12
nt
ntp
Vendor: ntp • v4.3.87
nt
ntp
Vendor: ntp • v4.3.55
nt
ntp
Vendor: ntp • v4.3.21
nt
ntp
Vendor: ntp • v4.3.33
nt
ntp
Vendor: ntp • v4.3.53
nt
ntp
Vendor: ntp • v4.3.31
nt
ntp
Vendor: ntp • v4.3.23
nt
ntp
Vendor: ntp • v4.3.68
nt
ntp
Vendor: ntp • v4.3.39
nt
ntp
Vendor: ntp • v4.3.29
nt
ntp
Vendor: ntp • v4.3.63
nt
ntp
Vendor: ntp • v4.3.91
or
solaris
Vendor: oracle • v10
nt
ntp
Vendor: ntp • v4.3.42
nt
ntp
Vendor: ntp • v4.3.54
nt
ntp
Vendor: ntp • v4.3.25
Timeline

Time Line

PUBLICATION
05 Jul 2016
MODIFICATION
12 Apr 2025
Impact Statistics

Key Metrics

CVSS Score
5.9
MEDIUM
Products
110
Affected
Remediation Protocol

Recommended Solution

No automatic solution found. Check vendor references.
Patch Library
No direct patch listed in database.
Recommended Actions for Administrators

Immediate Action Plan

1. Inventory

Identify all affected systems in your infrastructure.

2. Assessment

Assess exposure and criticality for your organization.

3. Mitigation

Apply patches or available workarounds.

4. Verification

Test and confirm effectiveness of applied measures.