TI-2016-04423 Aliases CVE-2016-5117 GHSA-4m25-49gx-cpq6

OpenNTPD before 6.0p1 does not validate the CN for HTTPS constraint requests, which…

LOW 28CWE-254Published 2017-01-31 · Updated 2024-08-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.00702 53rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openntpd:openntpd::::::::	up to 6.0	Vulnerable	Openntpd

cpe:2.3:a:openntpd:openntpd:*:*:*:*:*:*:*:* Versions up to 6.0 Vulnerable ·Openntpd

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2016-5117
2026-10-03 Alias added: GHSA-4m25-49gx-cpq6

References

Patch 1

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

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences