Descriptionntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ntp (PTS)buster1:4.2.8p12+dfsg-4vulnerable
ntpsec (PTS)buster1.1.3+dfsg1-2+deb10u1fixed
bookworm (security)1.2.2+dfsg1-1+deb12u1fixed
sid, trixie1.2.2+dfsg1-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ntpsecsource(unstable)(not affected)


[buster] - ntp <ignored> (Minor issue)
[stretch] - ntp <ignored> (Minor issue)
[jessie] - ntp <ignored> (Too intrusive to backport, requires new configuration)
- ntpsec <not-affected> (Doesn't affect ntpsec per upstream, #964395) (4.2.8p14) (4.2.8p14)

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