HOMEVULNERABILITIESCVE-2016-7434
HIGHPOC

CVE-2016-7434

CWE-20Published: January 13, 2017· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.

NVD Source

Technical Analysis

CVE-2016-7434 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.

A proof-of-concept (PoC) exploit exists for CVE-2016-7434. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

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

hpe1 product(s)
hpux-ntp
ntp1 product(s)
ntp
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
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

ADVISORYhttp://nwtime.org/ntp428p9_release/
ADVISORYhttp://support.ntp.org/bin/view/Main/NtpBug3082
ADVISORYhttp://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
ADVISORYhttp://www.securityfocus.com/bid/94448
ADVISORYhttp://www.securitytracker.com/id/1037354
ADVISORYhttps://bto.bluecoat.com/security-advisory/sa139
ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
ADVISORYhttps://www.exploit-db.com/exploits/40806/
ADVISORYhttps://www.kb.cert.org/vuls/id/633847
ADVISORYhttp://nwtime.org/ntp428p9_release/
ADVISORYhttp://support.ntp.org/bin/view/Main/NtpBug3082
ADVISORYhttp://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
ADVISORYhttp://www.securityfocus.com/bid/94448
ADVISORYhttp://www.securitytracker.com/id/1037354
ADVISORYhttps://bto.bluecoat.com/security-advisory/sa139
ADVISORYhttps://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
ADVISORYhttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
ADVISORYhttps://www.exploit-db.com/exploits/40806/
ADVISORYhttps://www.kb.cert.org/vuls/id/633847

All References (20)

→
http://nwtime.org/ntp428p9_release/Third Party Advisory
→
http://support.ntp.org/bin/view/Main/NtpBug3082Issue Tracking · Mitigation · Vendor Advisory
→
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes · Vendor Advisory
→
http://www.securityfocus.com/bid/94448Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1037354Third Party Advisory · VDB Entry
→
https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
→
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
→
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
→
https://www.exploit-db.com/exploits/40806/Exploit · Third Party Advisory · VDB Entry
→
https://www.kb.cert.org/vuls/id/633847Third Party Advisory · US Government Resource
→
http://nwtime.org/ntp428p9_release/Third Party Advisory
→
http://support.ntp.org/bin/view/Main/NtpBug3082Issue Tracking · Mitigation · Vendor Advisory
→
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes · Vendor Advisory
→
http://www.securityfocus.com/bid/94448Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1037354Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2016-7434
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
ExploitPOC
Affected2 vendor(s)
PublishedJan 13, 2017

Related CVEs (CWE-20)

CVE-2010-2298
10.0
CVE-2010-1518
10.0
CVE-2010-2193
10.0
CVE-2009-3245
10.0
CVE-2010-1517
10.0
CVE-2010-3186
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-7434 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.
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