CVE-2023-4012: ntpsec Incomplete Internal State Distinction
CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2023-4012DEBIAN-CVE-2023-4012DSA-5466-1
Published 07-08-2023Last modified 22-06-2026
Vulnerability summary
CVE-2023-4012 is a high (CVSS 7.5) Incomplete Internal State Distinction vulnerability in ntpsec. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.8% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 07-08-2023PublishedVulnerability first disclosed.
- 22-06-2026Last modifiedVulnerability information updated.
Description
ntpd will crash if the server is not NTS-enabled (no certificate) and it receives an NTS-enabled client request (mode 3).
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.45%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
0.00 pp
From 0.45% on 20-09-2026
20-09-202620-10-2026
EPSS score0.45%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- ntpsec< 1.2.2+dfsg1-2 | < 1.2.2+dfsg1-1+deb12u1
Ntpsec1 product
- ntpsec1.2.2
Ubuntu1 product
- ntpsecAll versions (No fix recorded)
3 vendors · 3 products
