CVE-2021-43759
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 · uneditedAdobe Media Encoder versions 22.0, 15.4.2 (and earlier) are affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR. Exploitation of this issue requires user interaction in that a victim must open a malicious MP4 file.
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 confidenceAdobe Media Encoder versions 22.0, 15.4.2 and earlier contain an out-of-bounds read vulnerability when parsing malicious MP4 files, allowing disclosure of sensitive memory and potentially bypassing ASLR mitigations.
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< 15.4.3= 22.0CVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/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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Verify Adobe Media Encoder is installedCheck for Adobe Media Encoder in the system. On Windows, look in Program Files/Adobe or check the Start Menu. On macOS, check /Applications for Adobe Media Encoder.appAffected if The software is not installed on the system, this CVE does not apply
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Determine the installed version numberOpen Adobe Media Encoder, then go to Help > About Adobe Media Encoder. Alternatively, right-click the application in the Control Panel or Programs and Features to view version detailsAffected if Unable to determine the version number - further investigation needed
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Compare version against affected rangesCompare your installed version to: any version below 15.4.3 (15.4.2, 15.4.1, 15.4, etc.) OR exactly version 22.0Affected if Installed version is 22.0 or any version 15.4.2 and earlier - your environment is affected by this CVE
You are affected if Adobe Media Encoder is installed and the version is either exactly 22.0 or falls within 15.4.2 and earlier (i.e., less than 15.4.3).
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 · scoped15.4.3
Update Adobe Media Encoder to a version newer than 22.0 or 15.4.2. Avoid opening untrusted or unexpected MP4 files from unverified sources.
Adobe Media Encoder 15.4.3 or later
- 1. Close Adobe Media Encoder if it is currently running
- 2. Navigate to the Adobe Media Encoder download page at helpx.adobe.com or use Adobe Creative Cloud desktop application
- 3. Download Adobe Media Encoder version 15.4.3 or later
- 4. Run the installer and follow the on-screen prompts to complete the installation
- 5. After installation, verify the installed version by opening Media Encoder and checking Help > About Adobe Media Encoder
- 6. Ensure the version displayed is 15.4.3 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 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 $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-43759 — 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-2021-43759 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