CVE-2021-43753
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 Lightroom versions 4.4 (and earlier) are affected by a use-after-free vulnerability in the processing of parsing TIF files that could result in privilege escalation. Exploitation of this issue requires user interaction in that a victim must open a malicious 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 Lightroom versions 4.4 and earlier contain a use-after-free vulnerability in the TIF file parsing logic. This memory corruption flaw can be triggered when a user opens a specially crafted malicious TIF file, potentially leading to privilege escalation. The CVSS 7.8 score reflects high exploitability requiring user interaction but achieving significant impact.
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< 5.1CVSS 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
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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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Identify installed Adobe Lightroom versionOpen Lightroom, go to Help > About Adobe Lightroom, or check the application version in the system installer/Applications listAffected if The installed version is 4.4 or earlier, or any version below 5.1
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Confirm TIF file processing capabilityAttempt to open a TIF file in Lightroom or verify TIF is a supported import format in the applicationAffected if TIF files can be imported or opened in the installed Lightroom version
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Review recent TIF file access logsCheck system file access logs, recent documents, or Lightroom import history for TIF files opened from untrusted or unknown sourcesAffected if TIF files from unverified sources were recently opened in the affected version of Lightroom
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Check for unexpected Lightroom behaviorLook for crashes, unusual memory usage, or error logs related to TIF file parsing in LightroomAffected if Any TIF-related crashes or memory corruption indicators have occurred while using the affected version
You are affected if Adobe Lightroom version 4.4 or earlier (below 5.1) is installed AND the application processes TIF files, enabling the vulnerable parsing logic to be triggered by a malicious file.
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 · scoped5.1
Update Adobe Lightroom to a version newer than 4.4. Avoid opening untrusted TIF files from unknown or unverified sources until the patch is applied.
Adobe Lightroom 5.1 or later
- Open Adobe Creative Cloud desktop application or Adobe Lightroom
- Navigate to the Updates or Apps section
- Locate Adobe Lightroom in the available updates
- Click Update or Install to upgrade to version 5.1 or later
- Alternatively, download Adobe Lightroom 5.1 or later from the official Adobe website (helpex.adobe.com)
- Launch the updated application and verify the version number shows 5.1 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 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 $1,664.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-43753 — 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-2021-43753 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