HIGH
CVE-2015-7704
CWE-20Published: August 7, 2017· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
The ntpd client in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service via a number of crafted "KOD" messages.
Technical Analysis
CVE-2015-7704 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 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
citrix1 product(s)
xenserver
Debian1 product(s)
debian linux
mcafee1 product(s)
enterprise security manager
netapp4 product(s)
oncommand performance manageroncommand unified managerclustered data ontapdata ontap
ntp1 product(s)
ntp
Red Hat6 product(s)
enterprise linux desktopenterprise linux serverenterprise linux server ausenterprise linux server eusenterprise linux server tusenterprise linux workstation
Source: NVD CPE · 40 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 (40)
→
http://bugs.ntp.org/show_bug.cgi?id=2901Issue Tracking · Vendor Advisory
→
http://rhn.redhat.com/errata/RHSA-2015-1930.htmlThird Party Advisory
→
http://rhn.redhat.com/errata/RHSA-2015-2520.htmlThird Party Advisory
→
http://support.ntp.org/bin/view/Main/NtpBug2901Vendor Advisory
→
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_4_2_8p4_SecuritRelease Notes · Vendor Advisory
→
http://www.debian.org/security/2015/dsa-3388Third Party Advisory
→
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
→
http://www.securityfocus.com/bid/77280Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1033951Third Party Advisory · VDB Entry
→
https://bugzilla.redhat.com/show_bug.cgi?id=1271070Issue Tracking · Third Party Advisory · VDB Entry
→
https://eprint.iacr.org/2015/1020.pdfTechnical Description · Third Party Advisory
→
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839Third Party Advisory · VDB Entry
→
https://kc.mcafee.com/corporate/index?page=content&id=SB10284Third Party Advisory
→
https://security.gentoo.org/glsa/201607-15Third Party Advisory · VDB Entry
→
https://security.netapp.com/advisory/ntap-20171004-0001/Third Party Advisory
Quick Facts
CVE IDCVE-2015-7704
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected6 vendor(s)
PublishedAug 7, 2017
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2015-7704 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.