Improper input validation in Ntp
CVE-2016-2517
NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey. NOTE: this vulnerability exists because of a CVE-2016-2516 regression.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.088 (94.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Ntp — versions 4.3.0, 4.3.1, 4.3.2
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)
- cve@mitre.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- cve@mitre.org (US Government Resource, x_refsource_CERT-VN, Third Party Advisory, third-party-advisory)
- cve@mitre.org (vdb-entry, x_refsource_SECTRACK)
- cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)
- cve@mitre.org (x_refsource_CONFIRM)
- cve@mitre.org (x_refsource_FREEBSD, vendor-advisory)
- cve@mitre.org (vendor-advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2016-2517?
- CVE-2016-2517 is a medium-severity vulnerability in Ntp, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2017-01-30.
- How severe is CVE-2016-2517?
- Medium severity. CVSS v3 base score is 5.3 out of 10.