Description
mstolfp in libntp/mstolfp.c in NTP 4.2.8p15 has an out-of-bounds write when adding a decimal point. An adversary may be able to attack a client ntpq process, but cannot attack ntpd.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 11 | ntp | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | ntp | No fix yet | — |
| Ubuntu 16.04 LTS | ntp | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | ntp | No fix yet | — |
| Ubuntu Pro 18.04 LTS | ntp | No fix yet | — |
| Ubuntu Pro 14.04 LTS | ntp | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | ntp | 4.2.8p15-150000.4.22.1 | SUSE-SU-2023:2142-1 |
| SLES 12 SP5 | ntp | 4.2.8p15-100.1 | SUSE-SU-2023:2171-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | ntp | 4.2.8p15-100.1 | SUSE-SU-2023:2171-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.4 | ntp | 4.2.8p15-150000.4.22.1 | SUSE-SU-2023:2142-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | ntp +4 | 4.2.8p15-3.amzn2.0.7 | ALAS2-2024-2396 |
Advisories 9
- SUSE-SU-2023:2142-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2171-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0938 ntp: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 6, 2025
- VDE-2024-073 Phoenix Contact: Multiple Vulnerabilities in PLCnext Firmware CERT@VDE · May 22, 2025
- NCSC-2024-0411 Kwetsbaarheden verholpen in Oracle Database producten NCSC-NL (Netherlands) · Oct 17, 2024
- NCSC-2024-0246 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 11, 2024
- ICSA-24-165-05 Siemens SITOP UPS1600 CISA ICS & IT advisories · Jun 11, 2024
- SSA-238730 SSA-238730: Out-of-Bounds Write Vulnerabilities in SITOP UPS1600 before V2.5.4 Siemens ProductCERT · Jun 11, 2024
- ALAS2-2024-2396 Moderate: ntp security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 15, 2024