CVE-2019-6468

BIND Supported Preview Edition can exit with an assertion failure if nxdomain-redirect is used

Description

In BIND Supported Preview Edition, an error in the nxdomain-redirect feature can occur in versions which support EDNS Client Subnet (ECS) features. In those versions which have ECS support, enabling nxdomain-redirect is likely to lead to BIND exiting due to assertion failure. Versions affected: BIND Supported Preview Edition version 9.10.5-S1 -> 9.11.5-S5. ONLY BIND Supported Preview Edition releases are affected.

Remediation

Solution:

  • Upgrade to the patched release most closely related to your current version of BIND: BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. + BIND 9.11.5-S6 + BIND 9.11.6-S1

Workaround:

  • Exploitation of this defect can be effectively prevented by disabling the nxdomain-redirect feature in the nameserver's configuration.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 1.06% Top 25%
Third-Party Advisory isc.org
Affected: ISC BIND 9 Supported Preview Edition
Published at:
Updated at:

References

Link Tags
https://kb.isc.org/docs/cve-2019-6468 third party advisory
https://www.synology.com/security/advisory/Synology_SA_19_20

Frequently Asked Questions

What is the severity of CVE-2019-6468?
CVE-2019-6468 has been scored as a high severity vulnerability.
How to fix CVE-2019-6468?
To fix CVE-2019-6468: Upgrade to the patched release most closely related to your current version of BIND: BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. + BIND 9.11.5-S6 + BIND 9.11.6-S1
Is CVE-2019-6468 being actively exploited in the wild?
It is possible that CVE-2019-6468 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-6468?
CVE-2019-6468 affects ISC BIND 9 Supported Preview Edition.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.