CVE-2015-5876
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 · unediteddyld in Dev Tools in Apple iOS before 9 allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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 confidenceA memory corruption vulnerability in dyld (the dynamic linker) within Apple iOS Dev Tools before version 9 allows a malicious crafted app to execute arbitrary code in a privileged context or cause a denial of service.
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= 1.0<= 8.4.1<= 10.10.5CVSS 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
- M
- Authentication
- None
- Confidentiality
- Complete
- Integrity
- Complete
- Availability
- Complete
AV:N/AC:M/Au:N/C:C/I:C/A:C
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 iPhone or iPadGo to Settings > General > About and look at the Version field, or use the command 'idevicesyslog' with device connected via USB to retrieve system infoAffected if Version displays 8.4.1 or lower (for example, 8.4, 8.3, 8.2, etc.)
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Check watchOS version on Apple WatchOpen the Watch app on paired iPhone, go to My Watch > General > About, or check directly on Apple Watch via Settings > AboutAffected if Version displays exactly 1.0
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Check macOS versionClick Apple menu > About This Mac, or run 'sw_vers' in TerminalAffected if Version displays 10.10.5 or lower (for example, 10.10.4, 10.10.3, 10.10.2, etc.)
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Verify dyld is accessible to user-installed appsThe vulnerability is triggered when a malicious crafted app executes; confirm device allows installation of third-party apps (not restricted via MDM or supervision)Affected if Device permits installation of apps from sources outside the App Store
A device is affected if it runs Apple iPhone OS <= 8.4.1, watchOS = 1.0, or macOS <= 10.10.5 and can execute third-party applications.
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.
dbcve · scopedUpgrade affected iOS devices to version 9 or later to obtain the patched dyld component; for enterprise deployments, identify and remediate devices running iOS versions prior to 9.
iOS 9.0+, watchOS 2.0+, OS X 10.11+
- Upgrade iOS devices (iPhone, iPad, iPod touch) to iOS 9.0 or later to address the dyld vulnerability in Dev Tools
- For Apple Watch devices, upgrade to watchOS 2.0 or later to address the WatchOS 1.0 vulnerability
- For Mac computers, upgrade to OS X 10.11 (El Capitan) or later to address the Mac OS X 10.10.5 vulnerability
- After upgrading, verify the system is running the patched version by checking Settings > General > About on iOS devices
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 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 $2,864.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-5876 — 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-2015-5876 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