CVE-2016-9311

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 11.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-01-13 · updated 2026-06-17
Weakness: CWE-476

Description

ntpd in NTP before 4.2.8p9, when the trap service is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a crafted packet.

Affected products

NTP: through 4.2.8

References

http://nwtime.org/ntp428p9_release/
http://rhn.redhat.com/errata/RHSA-2017-0252.html
http://support.ntp.org/bin/view/Main/NtpBug3119
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
http://www.securityfocus.com/bid/94444
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://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03799en_us
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03885en_us
https://usn.ubuntu.com/3707-2/

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