CVE-2016-7477
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 ff_put_pixels8_xy2_mmx function in rnd_template.c in Libav 11.7 allows remote attackers to cause a denial of service (invalid memory access and crash) via a crafted mp3 file. NOTE: this issue was originally reported as involving a NULL pointer dereference.
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 confidenceLibav 11.7 contains an invalid memory access vulnerability in the MMX-optimized ff_put_pixels8_xy2_mmx function in rnd_template.c. When processing a specially crafted mp3 file, this function can access invalid memory addresses, leading to a denial of service condition and crash. The issue was originally reported as a NULL pointer dereference.
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= 11.7CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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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Confirm Libav is installedRun 'avconv -version' or 'libavconfig-*.so --version' to check for Libav on the systemAffected if Libav binaries or libraries are present on the system
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Identify the exact Libav versionExamine the version string from the previous command output - look for the precise version numberAffected if The installed version is exactly 11.7
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Check if MMX-optimized functions are availableInspect the compiled Libav binary for MMX support - review build configuration files or run 'avconv -buildconf' if available to see if 'mmx' or 'MMX' appears in the enabled optimizationsAffected if MMX optimizations are compiled into the Libav build and the ff_put_pixels8_xy2_mmx function is present
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Determine if mp3 files are processedReview application logs, file processing records, or network captures to see if the system uses Libav to decode or process mp3 audio filesAffected if The system uses Libav to process mp3 files
The system is affected only if Libav version 11.7 is installed, MMX optimizations are enabled in the build, and the system processes mp3 files through Libav - all three conditions must be true.
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 to a patched version of Libav if available. If no patch exists, consider migrating to a maintained fork like FFmpeg, or implement input validation to reject malformed mp3 files before processing.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2016-7477 — 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-2016-7477 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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