What’s Vulnerable › Vulnerabilities

CVE-2016-7434

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 53.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-01-13 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• HPE Hpux-Ntp: from b.11.31 before c.4.2.8.2.0 — fixed in c.4.2.8.2.0
• NTP: from 4.3.0 before 4.3.94; 4.2.7-p100, 4.2.7-p101, 4.2.7-p102, 4.2.7-p103, 4.2.7-p104, 4.2.7-p105 (+484) — fixed in 4.3.94

How to fix

Upgrade to a fixed version: HPE Hpux-Ntp c.4.2.8.2.0; NTP 4.3.94. Check the vendor advisory for mitigations.

References

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

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