What’s Vulnerable › Vulnerabilities

CVE-2023-26555

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-04-11 · updated 2026-06-17
• Weakness: CWE-787

Description

praecis_parse in ntpd/refclock_palisade.c in NTP 4.2.8p15 has an out-of-bounds write. Any attack method would be complex, e.g., with a manipulated GPS receiver.

Affected products

• NTP: 4.2.8-p15

References

• https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555
• https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506546409
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY2SVYH4MKPAXEYHCCXD3Z6VGINLSVHK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3VHEHHWCTYSB7HVJLYPVK4RPJZ5LX52/
• https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555
• https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506546409
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IY2SVYH4MKPAXEYHCCXD3Z6VGINLSVHK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3VHEHHWCTYSB7HVJLYPVK4RPJZ5LX52/

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