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Zoom Plugin For Microsoft OutlookPlugin / extension · Zoom

CVE-2021-34410

HIGH · 7.8 CVSS v3.1 Published 2021-09-27
Fix available
A fix is available. Upgrade to 5.0.25611.0521 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

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 · unedited
A user-writable application bundle unpacked during the install for all versions of the Zoom Plugin for Microsoft Outlook for Mac before 5.0.25611.0521 allows for privilege escalation to root.

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 confidence

The Zoom Plugin for Microsoft Outlook for Mac versions before 5.0.25611.0521 unpacks an application bundle during installation with world-writable permissions, allowing a local unprivileged user to modify the bundle's contents and execute code with root privileges.

MitigationUpdate the Zoom Plugin for Microsoft Outlook for Mac to version 5.0.25611.0521 or later on all affected macOS systems.

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
Zoom Plugin For Microsoft OutlookPlugin / extension
Affected:< 5.0.25611.0521

CVSS 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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Locate the Zoom Plugin for Microsoft Outlook for Mac installation
    Open Finder, navigate to /Applications, and look for 'Zoom Plugin for Microsoft Outlook.app', or search for 'ZoomOutlook' in the filesystem using Spotlight or the find command
    Affected if The plugin is installed on the system
  2. Determine the installed version number
    Right-click the Zoom Plugin for Microsoft Outlook.app, select 'Get Info', and note the version number shown under 'Version:' in the General information section
    Affected if The version displayed is lower than 5.0.25611.0521 or the version field shows nothing or an earlier build number
  3. Verify the file permissions on the plugin bundle contents
    Open Terminal, navigate to the plugin location (typically in /Applications or ~/Applications), run 'ls -la' on the plugin bundle directory and subdirectories, and inspect the permission flags
    Affected if Any files or directories within the plugin bundle show 'rwxrwxrwx' (world-writable permissions) rather than restrictive permissions like 'rwxr-xr-x' or 'rw-r--r--'

A user is affected if the Zoom Plugin for Microsoft Outlook for Mac is installed and its version is below 5.0.25611.0521, particularly if the plugin bundle has world-writable permissions.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 5.0.25611.0521 or later
Fixed in 5.0.25611.0521
Interim mitigation

Update the Zoom Plugin for Microsoft Outlook for Mac to version 5.0.25611.0521 or later on all affected macOS systems.

Recommended fix High confidence

5.0.25611.0521 or later

  1. Check the currently installed version of Zoom Plugin for Microsoft Outlook by opening Outlook, going to the Zoom menu, and selecting 'About Zoom Plugin' or checking via Applications folder
  2. Uninstall the current version of Zoom Plugin for Microsoft Outlook from the Mac system
  3. Navigate to the official Zoom support page at explore.zoom.us and download the latest version of the Zoom Plugin for Microsoft Outlook for Mac
  4. Verify the downloaded installer version is 5.0.25611.0521 or later
  5. Run the installer and follow the prompts to install the updated plugin
  6. Restart Microsoft Outlook and verify the plugin is working correctly
  7. Confirm the installed version is 5.0.25611.0521 or newer

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Zoom Plugin For Microsoft Outlook Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-34410 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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