HOMEVULNERABILITIESCVE-2023-26555
MEDIUM

CVE-2023-26555

CWE-787Published: April 11, 2023· Updated: Jun 17, 2026

6.4
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-26555 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.4.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorPhysical
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

ntp1 product(s)
ntp
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555
ADVISORYhttps://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555

All References (8)

→
https://github.com/spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26555Third Party Advisory
→
https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506546409Issue Tracking
→
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-2023-26555Third Party Advisory
→
https://github.com/spwpun/ntp-4.2.8p15-cves/issues/1#issuecomment-1506546409Issue Tracking
→
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/

Quick Facts

CVE IDCVE-2023-26555
CVSS Score6.4 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected1 vendor(s)
PublishedApr 11, 2023

Related CVEs (CWE-787)

CVE-2012-0751
10.0
CVE-2015-5105
10.0
CVE-2026-42369
10.0
CVE-2002-2227
10.0
CVE-2012-3957
10.0
CVE-2018-2913
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-26555 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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