dbcve.org
MeetingsApplication · Zoom

CVE-2021-34425

MEDIUM · 6.1 CVSS v3.1 Published 2021-12-14
Fix available
A fix is available. Upgrade to 5.7.3 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
The Zoom Client for Meetings before version 5.7.3 (for Android, iOS, Linux, macOS, and Windows) contain a server side request forgery vulnerability in the chat\'s "link preview" functionality. In versions prior to 5.7.3, if a user were to enable the chat\'s "link preview" feature, a malicious actor could trick the user into potentially sending arbitrary HTTP GET requests to URLs that the actor cannot reach directly.

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

This is a Server-Side Request Forgery (SSRF) vulnerability in Zoom's chat link preview feature. When enabled, the client fetches previews for URLs shared in chat, and a malicious actor could craft messages containing specially crafted URLs that cause the victim's Zoom client to send arbitrary HTTP GET requests to internal or external resources the attacker cannot reach directly, potentially exposing internal services, cloud metadata endpoints, or enabling internal network reconnaissance.

MitigationUpdate Zoom Client for Meetings to version 5.7.3 or later. Alternatively, disable the chat link preview feature as a workaround until patching is complete.

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
MeetingsApplication
Affected:< 5.7.3

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
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 checks

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

  1. Find installed Zoom version
    Open the Zoom desktop client, click your profile picture or initials in the top-right corner, then select 'Check for Updates' or look in Help > About Zoom to see the currently installed version number.
    Affected if The installed version is lower than 5.7.3 (for example, 5.7.2, 5.6.10, etc.)
  2. Locate chat link preview setting
    In the Zoom desktop client, go to Settings (gear icon), then navigate to the Chat or Sharing section. Look for options labeled 'Enable link preview', 'Show link previews', or similar.
    Affected if The chat link preview feature is currently enabled or set to 'On'.
  3. Verify version against affected range
    Compare your identified version number to the affected range: any version before 5.7.3 (such as 5.7.2, 5.7.1, 5.7.0, or earlier major/minor releases) is within the vulnerable range.
    Affected if Your Zoom Meetings version is any build lower than 5.7.3.

You are affected if your Zoom Meetings client version is below 5.7.3 AND the chat link preview feature is enabled, as this combination allows specially crafted URLs in chat messages to trigger arbitrary HTTP requests from your client.

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 5.7.3 or later
Fixed in 5.7.3
Interim mitigation

Update Zoom Client for Meetings to version 5.7.3 or later. Alternatively, disable the chat link preview feature as a workaround until patching is complete.

Recommended fix High confidence

5.7.3 or later ( Meetings client)

  1. Open Zoom Client for Meetings
  2. Navigate to the settings or check for updates
  3. Update to version 5.7.3 or later for your platform (Android, iOS, Linux, macOS, or Windows)
  4. Alternatively, download the latest version from the official Zoom website or your platform's app store

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

Fix this in Meetings Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,930
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.

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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-2021-34425 in production — separate from our analysis above.

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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