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Public proof of conceptFix available

CVE-2019-6443

A public proof of concept exists; no exploitation attested.

  • Published2019-01-16
  • Fixed in1.1.3
  • WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in NTPsec before 1.1.3. Because of a bug in ctl_getitem, there is a stack-based buffer over-read in read_sysvars in ntp_control.c in ntpd.

Timeline

dates in UTC
  1. 2019-01-16Exploit-DB entryExploit-DB

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-6443?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-6443?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Ntpsec
BranchAffectedFixed in
1.1< 1.1.31.1.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • ntpsecUbuntu:18.04:LTSall versions · fixed in 1.1.0+dfsg1-1ubuntu0.2
  • ntpsecopenSUSE:Tumbleweedall versions · fixed in 1.2.1-1.2
  • ntpsecDebian:14all versions · fixed in 1.1.3+dfsg1-1
  • ntpsecDebian:13all versions · fixed in 1.1.3+dfsg1-1
  • ntpsecDebian:12all versions · fixed in 1.1.3+dfsg1-1
  • ntpsecCleanStartall versions · fixed in 1.1.3-r0
  • ntpsecAlpine:v3.24all versions · fixed in 1.1.3-r0
  • ntpsecAlpine:v3.23all versions · fixed in 1.1.3-r0

13 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Ntpsec to 1.1.3

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-46175
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
2019-01-16
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2019-6443?

An issue was discovered in NTPsec before 1.1.3. Because of a bug in ctl_getitem, there is a stack-based buffer over-read in read_sysvars in ntp_control.c in ntpd.

Is CVE-2019-6443 actively exploited?

Active exploitation of CVE-2019-6443 has not been confirmed. Its EPSS score was 66.9% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-6443?

CVE-2019-6443 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

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Sources for this record