CVE-2011-3834
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 the in_avi.dll plugin in Winamp before 5.623 allow remote attackers to execute arbitrary code via an AVI file with a crafted value for (1) the number of streams or (2) the size of the RIFF INFO chunk, leading to a heap-based buffer overflow.
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 confidenceInteger overflow vulnerabilities in Winamp's in_ai.dll plugin allow remote code execution through specially crafted AVI files. The overflows occur when parsing the number of streams or the size of the RIFF INFO chunk, leading to heap-based buffer overflows that can be exploited to execute arbitrary code.
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<= 5.622= 0.20a= 0.92= 1.006= 1.90= 2.0= 2.6= 2.9= 2.10= 2.91= 2.92= 2.95CVSS 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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Verify Winamp is installedCheck for Winamp installation directory, typically in C:\Program Files\Winamp or C:\Program Files (x86)\Winamp, or search for winamp.exeAffected if Winamp is installed on the system
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Identify the Winamp versionRight-click winamp.exe, select Properties, and view the File Version under the Details tab, or right-click the Winamp title bar and go to About WinampAffected if The installed version is 5.622 or lower, or matches any of these: 0.20a, 0.92, 1.006, 1.90, 2.0, 2.6, 2.9, 2.10, 2.91, 2.92, or 2.95
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Confirm the in_avi.dll plugin existsLocate the in_avi.dll file in the Winamp plugins folder, typically C:\Program Files\Winamp\Plugins\in_avi.dll or C:\Program Files (x86)\Winamp\Plugins\in_avi.dllAffected if The in_avi.dll plugin is present in the Winamp plugins directory
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Verify the plugin is enabled for AVI playbackOpen Winamp, go to Options > Preferences > Plugins > Input, and check if 'Nullsoft AVI File Decoder' (in_avi.dll) is listed and enabledAffected if The AVI input plugin is enabled in Winamp's configuration
The system is affected if Winamp is installed with a version 5.622 or lower (or any of the specific older versions listed) and the in_avi.dll plugin is present and enabled for AVI file handling.
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 Winamp to version 5.623 or later to patch the vulnerable in_avi.dll plugin. Avoid opening untrusted AVI files from unknown sources until the update is applied.
Winamp 5.623
- Upgrade Winamp to version 5.623 or later to address the integer overflow vulnerabilities in the in_avi.dll plugin
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2011-3834 — 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-2011-3834 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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