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CVE-2023-26554

16
FAUCET Score

CVE-2023-26554 describes an out-of-bounds write vulnerability in the mstolfp function of libntp/mstolfp.c within NTP version 4.2.8p15. This flaw specifically impacts client ntpq processes, not the ntpd daemon. With a CVSS score of 5.6 (Medium), successful exploitation requires high attack complexity and could lead to limited confidentiality, integrity, and availability impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p15:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.6MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.2
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.65%
Probability of exploitation in next 30 days
EPSS Percentile
47.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0065 is in the 9th percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2023-26554Moderate

ntp: an out-of-bounds write when adding a '\0' character

Apr 12, 2023

References

github.com / spwpun/ntp-4.2.8p15-cves/blob/main/CVE-2023-26554
Third Party Advisory
github.com / spwpun/ntp-4.2.8p15-cves/issues/1
Third Party Advisory