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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade chrony | Aug 30, 2017 | Apr 16, 2015 |
| Debian | — | Upgrade chrony | Jul 30, 2024 | Dec 9, 2019 |
| Freebsd | — | Upgrade chrony | Dec 10, 2025 | Apr 18, 2015 |
| Gentoo Linux | — | Upgrade net-misc/chrony. | Oct 30, 2017 | Jul 5, 2015 |
| Oracle_linux | — | Upgrade chrony | Oct 16, 2024 | Dec 9, 2019 |
| Ubuntu | — | Upgrade chrony | Nov 19, 2024 | Dec 9, 2019 |
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