CVE-2019-5506
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 · uneditedClustered Data ONTAP versions 9.0 and higher do not enforce hostname verification under certain circumstances making them susceptible to impersonation via man-in-the-middle attacks.
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 · moderate confidenceClustered Data ONTAP versions 9.0 and higher fail to enforce hostname verification for TLS connections in certain circumstances, allowing attackers to perform man-in-the-middle attacks by presenting valid certificates for arbitrary hostnames, enabling impersonation of legitimate storage services.
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>= 9.0, <= 9.6= 9.6CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
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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Determine Clustered Data ONTAP versionRun the command 'version' or 'system node show -fields version' from the ONTAP CLI or via ONTAP API to retrieve the installed software versionAffected if The installed version falls within 9.0 through 9.6 (inclusive)
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Identify TLS-enabled services in useReview which ONTAP services are configured to use TLS/SSL, such as HTTPS for management interfaces, SSL/SSH for administrative access, or TLS-based data transfer protocolsAffected if Any TLS-enabled service is active without hostname verification enforced
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Inspect TLS hostname verification settingsExamine the TLS configuration using 'security ssl' or 'security certificate' commands, and check if hostname verification is explicitly enabled in the TLS policyAffected if Hostname verification is disabled, not configured, or set to allow any hostname in TLS settings
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Verify certificate validation behaviorTest TLS connections from the ONTAP system to external endpoints by capturing network traffic or reviewing logs for certificate validation errorsAffected if Certificates are accepted without validating that the certificate hostname matches the target hostname
A system is affected if it runs Clustered Data ONTAP version 9.0 through 9.6 and has TLS connections configured without hostname verification enforcement.
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 dataEnable and enforce hostname verification in Clustered Data ONTAP TLS configurations or apply vendor-provided patches to ensure proper certificate hostname validation.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,544.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-5506 — 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-2019-5506 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
- No spam, self-promotion, credentials, or personal data