SARA / Free Tools / CVE / CVE-2023-4012

CVE-2023-4012 — ntpd will crash if the server is not NTS-enabled (no certificate) and it receive

ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3).

CVSS

7.5 HIGH

EPSS

0.23% (top 54.60%)

CWE

CWE-372

Published

2023-08-07T17:30:33.452Z

Last modified

2024-08-30T15:47:52.675Z

CVSS vector

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

01What is this vulnerability?

ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3).

Vendor	Product	Versions
NTPsec	ntpsec	1.2.2

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

Patch to a fixed version listed in the vendor advisory (see references below).
Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
Hunt historical logs for exploitation indicators — see Detection signatures below.

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

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