FirefoxWeb browser · Mozilla
CVE-2015-4496
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 · uneditedMultiple integer overflows in libstagefright in Mozilla Firefox before 38.0 allow remote attackers to execute arbitrary code via crafted sample metadata in an MPEG-4 video file, a related issue to CVE-2015-1538.
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 confidenceMultiple integer overflows in Mozilla Firefox's libstagefright when parsing MPEG-4 video sample metadata allow remote attackers to execute arbitrary code by tricking users into opening specially crafted video files.
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
FirefoxWeb browser
<= 37.0.2= 11.3CVSS 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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Identify Firefox versionOpen Firefox, go to Help > About Firefox, or run 'firefox --version' from command lineAffected if Version number is 37.0.2 or lower
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Check for libstagefright library presenceSearch for libstagefright.so in Firefox installation directory or system libraries (common paths: /usr/lib/firefox/, ~/.mozilla/)Affected if The libstagefright library file exists in the Firefox installation
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Verify handling of MPEG-4 video contentCheck if Firefox has been used to open or preview .mp4, .m4v, or similar MPEG-4 container files; review browser history for media file accessAffected if Users have opened or previewed MPEG-4 video files in Firefox
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Confirm Solaris environment (if applicable)On Oracle Solaris 11.3, check for presence of libstagefright in /usr/lib/ or application-specific paths using 'find /usr/lib -name '*stagefright*'Affected if Running Oracle Solaris 11.3 with libstagefright library present
If Firefox version is 37.0.2 or lower and the libstagefright library is present and has processed MPEG-4 video files, the system is vulnerable to arbitrary code execution via the integer overflow flaw.
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 Firefox to version 38.0 or later, which contains patched bounds checking in the libstagefright sample metadata parser. For custom applications using libstagefright, apply the corresponding upstream patch.
Firefox 38.0 or later
- Check current Firefox version via Help > About Firefox or by running 'firefox --version' in command line
- Back up your Firefox profile folder (contains bookmarks, passwords, saved sessions) before upgrading
- Download Firefox 38.0 or later from the official Mozilla website (www.mozilla.org)
- Uninstall the current Firefox version
- Install the upgraded Firefox 38.0 or later version
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 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 $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-4496 — 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-2015-4496 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