CVE-2016-5117

medium

Description

OpenNTPD before 6.0p1 does not validate the CN for HTTPS constraint requests, which allows remote attackers to bypass the man-in-the-middle mitigations via a crafted timestamp constraint with a valid certificate.

References

Advisories
More

http://www.openwall.com/lists/oss-security/2016/05/29/6

http://www.openwall.com/lists/oss-security/2016/05/23/2

http://www.openntpd.org/txt/release-6.0p1.txt

http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28

Details

Source: Mitre, NVD

Published: 2017-01-31

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N