CVE-2019-6476 — A defect in code added to support QNAME minimization can cause named to exit wit

A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query. This affects BIND versions 9.14.0 up to 9.14.6, and 9.15.0 up to 9.15.4.

01What is this vulnerability?

A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query. This affects BIND versions 9.14.0 up to 9.14.6, and 9.15.0 up to 9.15.4.

02Affected products

Vendor	Product	Versions
ISC	BIND 9	9.14.0 up to 9.14.6, 9.15.0 up to 9.15.4

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-10-17T19:17:39.240Z
• Last modified: 2024-09-16T16:58:26.060Z

09References

• kb.isc.org — https://kb.isc.org/docs/cve-2019-6476
• security.netapp.com — https://security.netapp.com/advisory/ntap-20191024-0004/
• support.f5.com — https://support.f5.com/csp/article/K42238532?utm_source=f5support&amp%3Butm_medi…