CVE-2015-1853

unknown

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

—

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2015-1853

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`1.30-2`
debian	bullseye	fixed	`1.30-2`
debian	forky	fixed	`1.30-2`
debian	sid	fixed	`1.30-2`
debian	trixie	fixed	`1.30-2`

References

https://security-tracker.debian.org/tracker/CVE-2015-1853

Verify integrity in audit chain (admin only). AS-IS.