CVE-2016-5117

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.

• CWE-254

• http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28Patch
• http://www.openntpd.org/txt/release-6.0p1.txtVendor Advisory
• http://www.openwall.com/lists/oss-security/2016/05/23/2Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2016/05/29/6Mailing List, Third Party Advisory
• http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28Patch
• http://www.openntpd.org/txt/release-6.0p1.txtVendor Advisory
• http://www.openwall.com/lists/oss-security/2016/05/23/2Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2016/05/29/6Mailing List, Third Party Advisory

Published

Jan 31, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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