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TI-2026-15070 Aliases CVE-2026-18321GHSA-6978-pcpc-2c45

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in ntpsec

Priority LOW 20CWE-120Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00111 1st percentileScored 2026-11-07
Fix Fixed ntpsec (NTPsec): 1.2.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NTPsecntpsecbefore 1.2.51.2.5Patch availableCNA
  • ntpsec VendorNTPsec Affected before 1.2.5 Fixed in 1.2.5 Patch available CNA

Remediation

  • Fix · CNA ntpsec (NTPsec) Fixed in 1.2.5

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-18321
  2. 2026-10-03 Alias added: GHSA-6978-pcpc-2c45

References

Other 1

  • TI-2019-04513 An issue was discovered in NTPsec before 1.1.3. CVSS 3.0CRITICAL 9.1
  • TI-2019-04514 An issue was discovered in NTPsec before 1.1.3. CVSS 3.0CRITICAL 9.1
  • TI-2026-42067 gpsd gpsprof Command Injection via gnuplot plot title subtype field CVSS 4.0HIGH 8.4
  • TI-2019-04515 An issue was discovered in NTPsec before 1.1.3. CVSS 3.0MEDIUM 6.5
  • TI-2019-04512 An issue was discovered in NTPsec before 1.1.3. CVSS 3.0MEDIUM 6.5
  • TI-2026-78850 Out-of-bounds read in NTPsec ntpd NTS extension field parsing CVSS 3.1HIGH 7.5
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences