MEDIUM
CVE-2016-2518
CWE-125Published: January 30, 2017· Updated: Jun 17, 2026
5.3
CVSS v3.1
Official Description
The MATCH_ASSOC function in NTP before version 4.2.8p9 and 4.3.x before 4.3.92 allows remote attackers to cause an out-of-bounds reference via an addpeer request with a large hmode value.
Technical Analysis
CVE-2016-2518 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Vendors & Products
Debian1 product(s)
debian linux
freebsd1 product(s)
freebsd
netapp5 product(s)
clustered data ontapdata ontaponcommand balanceoncommand performance manageroncommand unified manager for clustered data ontap
ntp1 product(s)
ntp
Oracle2 product(s)
communications user data repositorylinux
Red Hat6 product(s)
enterprise linux desktopenterprise linux serverenterprise linux server ausenterprise linux server eusenterprise linux server tusenterprise linux workstation
siemens2 product(s)
simatic net cp 443-1 opc ua firmwaresimatic net cp 443-1 opc ua
Source: NVD CPE · 38 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (66)
→
→
http://support.ntp.org/bin/view/Main/NtpBug3009Vendor Advisory
Quick Facts
CVE IDCVE-2016-2518
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected7 vendor(s)
PublishedJan 30, 2017
Related CVEs (CWE-125)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-2518 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.