CVE-2015-1853

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

chrony before 1.31.1 does not properly protect state variables in authenticated symmetric NTP associations, which allows remote attackers with knowledge of NTP peering to cause a denial of service (inability to synchronize) via random timestamps in crafted NTP data packets.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

Vendor	Product	Versions
chrony	chrony	before 1.31.1

References

http://chrony.tuxfamily.org/News.htmlRelease Notes, Vendor Advisory
https://security.gentoo.org/glsa/201507-01Third Party Advisory
http://chrony.tuxfamily.org/News.htmlRelease Notes, Vendor Advisory
https://security.gentoo.org/glsa/201507-01Third Party Advisory

Timeline

Published: Dec 9, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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