What’s Vulnerable › Vulnerabilities

CVE-2019-6474: A packet containing a malformed DUID can cause the kea-dhcp6 server to terminate

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-16 · updated 2026-06-17
• Weakness: CWE-772

Description

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

Affected products

• ISC Kea: from 1.4.0 through 1.5.0; 1.6.0-beta1, 1.6.0-beta2

References

• https://kb.isc.org/docs/cve-2019-6474
• https://kb.isc.org/docs/cve-2019-6474

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