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TI-2019-04538 Aliases CVE-2019-6474GHSA-qxx9-pw4x-fc72

A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate

Priority LOW 30CWE-772Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-772.

Summary

A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2

Why it matters now

EPSS 0.00717 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ISCKea1.4.0 to 1.5.0; 1.6.0-beta1; 1.6.0-beta2—No fix listedCNA
  • Kea VendorISC Affected 1.4.0 to 1.5.0; 1.6.0-beta1; 1.6.0-beta2 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:isc:kea:*:*:*:*:*:*:*:*1.4.0 – 1.5.0VulnerableISC
cpe:2.3:a:isc:kea:1.6.0:beta1:*:*:*:*:*:*1.6.0 beta1VulnerableISC
cpe:2.3:a:isc:kea:1.6.0:beta2:*:*:*:*:*:*1.6.0 beta2VulnerableISC
  • cpe:2.3:a:isc:kea:*:*:*:*:*:*:*:* Versions 1.4.0 – 1.5.0 Vulnerable ·ISC
  • cpe:2.3:a:isc:kea:1.6.0:beta1:*:*:*:*:*:* Versions 1.6.0 beta1 Vulnerable ·ISC
  • cpe:2.3:a:isc:kea:1.6.0:beta2:*:*:*:*:*:* Versions 1.6.0 beta2 Vulnerable ·ISC

Remediation

No fixed version listed by the sources yet.

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-2019-6474
  2. 2026-10-03 Alias added: GHSA-qxx9-pw4x-fc72

References

Advisory 1

  • TI-2018-04146 Failure to release memory may exhaust system resources CVSS 3.0HIGH 7.5
  • TI-2015-06893 The kea-dhcp4 and kea-dhcp6 servers 0.9.2 and 1.0.0-beta in ISC Kea, when certain… CVSS 3.0MEDIUM 6.8
  • TI-2019-04536 A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate CVSS 3.1MEDIUM 6.5

Sources

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