CVE-2017-9566
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 · uneditedThe fsb-dequeen-mobile-banking/id1091025340 app 3.0.1 for iOS does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
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 confidenceThe fsb-dequeen-mobile-banking iOS app version 3.0.1 fails to validate X.509 certificates from SSL servers, allowing man-in-the-middle attackers to present fraudulent certificates and intercept sensitive data transmitted between the app and legitimate servers.
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= 3.0.1CVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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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Identify if Fsb Dequeen Mobile Banking app is installedCheck iOS devices for the presence of the Meafinancial Fsb Dequeen Mobile Banking app - review installed applications through device management software, MDM solution, or manually on each deviceAffected if The app is present on any iOS device in the environment
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Check the installed app versionLocate the app version in the iOS App Store listing, device settings under Apps > Fsb Dequeen Mobile Banking, or through MDM/software inventory toolsAffected if The version number is exactly 3.0.1
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Confirm product name matches vulnerable identifierVerify the app name is exactly 'Fsb Dequeen Mobile Banking' or 'Meafinancial Fsb Dequeen Mobile Banking' - not a similarly named banking app from a different vendorAffected if The app name matches 'Fsb Dequeen Mobile Banking' or 'Meafinancial Fsb Dequeen Mobile Banking' at version 3.0.1
If the Fsb Dequeen Mobile Banking iOS app version 3.0.1 is installed on any device in the environment, the SSL certificate validation flaw is present and traffic can be intercepted by man-in-the-middle attackers.
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 dataImplement proper SSL/TLS certificate validation using NSURLSession's default certificate handling or add explicit certificate pinning to ensure the app only trusts expected server certificates.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-9566 — 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-2017-9566 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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