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CVE-2016-1548

An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for…

High7.2EPSS 3.8%
Published
Updated
Reserved
Assigned by
certcc

Description

An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

Scores

CVSS scores of CVE-2016-1548, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0High7.2CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
EPSS (exploitation in 30 days)
3.8% · top 10.0% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Weakness

Affected products

  • NTP Project · NTP

    • affected 4.2.8p4

  • NTPsec Project · NTPSec

    • affected aa48d001683e5b791a743ec9c575aaf7d867a2b0c

References (34)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .