Medium severity5.9NVD Advisory· Published Jan 31, 2017· Updated Jun 17, 2026

CVE-2016-5117

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

OpenNTPD/OpenNTPD
cpe:2.3:a:openntpd:openntpd:*:*:*:*:*:*:*:*
Range: <=6.0
OpenBSD/OpenNTPDllm-create
Range: <6.0p1

Patches

Vulnerability mechanics

References

cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diffnvdPatch
www.openntpd.org/txt/release-6.0p1.txtnvdVendor Advisory
www.openwall.com/lists/oss-security/2016/05/23/2nvdMailing ListThird Party Advisory
www.openwall.com/lists/oss-security/2016/05/29/6nvdMailing ListThird Party Advisory

News mentions

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cvss	0.384
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000