What’s Vulnerable › Vulnerabilities

CVE-2019-6467: An error in the nxdomain redirect feature can cause BIND to exit with an INSIST assertion failure in query.c

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-09 · updated 2026-06-17
• Weakness: CWE-617

Description

A programming error in the nxdomain-redirect feature can cause an assertion failure in query.c if the alternate namespace used by nxdomain-redirect is a descendant of a zone that is served locally. The most likely scenario where this might occur is if the server, in addition to performing NXDOMAIN redirection for recursive clients, is also serving a local copy of the root zone or using mirroring to provide the root zone, although other configurations are also possible. Versions affected: BIND 9.12.0-> 9.12.4, 9.14.0. Also affects all releases in the 9.13 development branch.

Affected products

• ISC BIND: from 9.12.0 through 9.12.4; from 9.13.0 through 9.13.7; 9.14.0

References

• https://kb.isc.org/docs/cve-2019-6467
• https://www.synology.com/security/advisory/Synology_SA_19_20
• https://kb.isc.org/docs/cve-2019-6467
• https://www.synology.com/security/advisory/Synology_SA_19_20

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