CVE-2019-6468
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceIn BIND Supported Preview Edition, an error in the nxdomain-redirect feature combined with EDNS Client Subnet (ECS) support causes BIND to exit via assertion failure when nxdomain-redirect is enabled. Only S-series releases (9.10.5-S1 through 9.11.5-S5) with ECS capability are affected.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 9.10.5= 9.11.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify BIND version and editionRun 'named -v' or 'named -V' to obtain the installed BIND version string. Look for an 'S' in the version indicating a Supported Preview Edition, and verify the numeric version falls between 9.10.5-S1 and 9.11.5-S5.Affected if Running an S-series version between 9.10.5-S1 and 9.11.5-S5 inclusive
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Determine if nxdomain-redirect is enabledSearch BIND configuration files (typically named.conf or included files) for 'nxdomain-redirect' directives. Check both global options and zone configurations for this feature.Affected if The nxdomain-redirect feature is explicitly enabled in the configuration
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Check if EDNS Client Subnet (ECS) is activeReview BIND configuration for 'edns-client-subnet' options. Also verify whether ECS support is compiled into the binary. ECS may be enabled per-zone or globally, or present in the build.Affected if EDNS Client Subnet support is enabled in configuration or compiled into the BIND binary
A system is affected only when running a vulnerable S-series BIND version (9.10.5-S1 through 9.11.5-S5) with both nxdomain-redirect and EDNS Client Subnet features simultaneously enabled, causing an assertion failure crash.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataDisable the nxdomain-redirect feature or disable EDNS Client Subnet support in affected BIND configurations, or upgrade to a patched non-Preview release.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-6468 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-6468 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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