CVE-2015-6999
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 OCSP client in Apple iOS before 9.1 does not check for certificate expiry, which allows remote attackers to spoof a valid certificate by leveraging access to a revoked 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 OCSP (Online Certificate Status Protocol) client in Apple iOS versions prior to 9.1 fails to validate certificate expiry dates during chain verification. This allows an attacker with access to a revoked certificate to potentially spoof a valid certificate, bypassing a critical security check in the certificate validation process.
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<= 9.0.2CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- Partial
- Availability
- None
AV:N/AC:L/Au:N/C:N/I:P/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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Check iOS version on deviceNavigate to Settings > General > About > Version on the iOS device to view the installed iOS version numberAffected if The version displayed is 9.0.2 or earlier (such as 9.0, 9.0.1, or 9.0.2)
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Verify iOS build number for precisionIn Settings > General > About, note the Build number and cross-reference with Apple security content for iOS 9.1 to confirm the version is pre-9.1Affected if The device is running a build associated with iOS versions prior to 9.1
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Check if device uses certificate validationDetermine if the device is used for TLS/SSL connections that rely on certificate chain validation (most network communications)Affected if The device performs certificate validation over network connections and is running iOS 9.0.2 or earlier
A device is affected if it is running any version of iOS up to and including 9.0.2, as the OCSP client in these versions fails to validate certificate expiry dates during chain verification.
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 dataUpgrade iOS devices to version 9.1 or later, which includes the fix for proper certificate expiry checking in the OCSP client.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-6999 — 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-2015-6999 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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