Webex MeetingsApplication · Cisco
CVE-2020-3342
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 · uneditedA vulnerability in the software update feature of Cisco Webex Meetings Desktop App for Mac could allow an unauthenticated, remote attacker to execute arbitrary code on an affected system. The vulnerability is due to improper validation of cryptographic protections on files that are downloaded by the application as part of a software update. An attacker could exploit this vulnerability by persuading a user to go to a website that returns files to the client that are similar to files that are returned from a valid Webex website. The client may fail to properly validate the cryptographic protections of the provided files before executing them as part of an update. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the user.
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 confidenceThe Cisco Webex Meetings Desktop App for Mac has a vulnerability in its software update mechanism where cryptographic protections (likely code signing/signature validation) on downloaded update files are not properly validated. An attacker can serve malicious files from a website that mimic legitimate Webex update files, causing the vulnerable client to execute arbitrary code with the user's privileges.
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
Webex MeetingsApplication
< 39.5.11CVSS 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
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/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 if Cisco Webex Meetings is installedOpen Finder, navigate to /Applications folder and look for 'Webex Meetings.app', or run: ls /Applications | grep -i webexAffected if The application is present on the system
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Determine the installed version of Webex MeetingsRight-click Webex Meetings.app and select 'Get Info', or run: defaults read /Applications/Webex\ Meetings.app/Contents/Info CFBundleShortVersionStringAffected if The version displayed is below 39.5.11
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Compare against affected versionReview the version number obtained; the affected range is any version lower than 39.5.11Affected if Installed version is 39.5.10 or earlier, or shows a version number less than 39.5.11
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Verify if software update mechanism is configuredOpen Webex Meetings app, go to Preferences or Settings and check if automatic updates are enabled, or inspect the app's update configurationAffected if Automatic updates are enabled and the client can fetch updates from network locations
A user is affected if Cisco Webex Meetings for Mac is installed with a version lower than 39.5.11 and the software update feature is active.
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.
From vendor data39.5.11
Apply the vendor patch from Cisco for CVE-2020-3342. Users should ensure software updates are performed only when connected to trusted networks and should verify updates originate from official Cisco Webex sources.
Fix this in Webex Meetings
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 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 $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3342 — 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-2020-3342 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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