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Vulnerabilities

Vulnerability · CVE-2019-6443

ntpsec ntpsec Out-of-bounds Read

Published Oct 20, 2025 · catalog updated Oct 20, 2025 · ntpsec ntpsec Out-of-bounds Read

Patch now

CVE-2019-6443 is in the CISA known-exploited catalog. Confirm ntpsec ntpsec Out-of-bounds Read against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (ntpsec ntpsec Out-of-bounds Read).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
66.88%
Remediation
Remediation guidance
Affected products
vendor ntpsec ntpsec

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor ntpsec ntpsecversion unspecified

How to fix CVE-2019-6443

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2019-6443 is in the CISA known-exploited catalog. Confirm ntpsec ntpsec Out-of-bounds Read against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 66.88%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2025 · VulnCheck KEV

    Detected

    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.

  2. Oct 20, 2025 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2019-6443

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2019-6443

    30-day exploitation probability 66.9%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.