MEDIUM
CVE-2015-7973
CWE-254Published: January 30, 2017· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
NTP before 4.2.8p6 and 4.3.x before 4.3.90, when configured in broadcast mode, allows man-in-the-middle attackers to conduct replay attacks by sniffing the network.
Technical Analysis
CVE-2015-7973 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.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Affected Vendors & Products
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
ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us
ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us
ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us
All References (44)
→
http://support.ntp.org/bin/view/Main/NtpBug2935Vendor Advisory
→
→
http://www.securityfocus.com/bid/81963Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1034782Third Party Advisory · VDB Entry
→
http://www.ubuntu.com/usn/USN-3096-1Third Party Advisory
→
https://bto.bluecoat.com/security-advisory/sa113Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdfThird Party Advisory
Quick Facts
CVE IDCVE-2015-7973
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-254
CISA KEVNo
Affected5 vendor(s)
PublishedJan 30, 2017
Related CVEs (CWE-254)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2015-7973 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.