CVE-2020-3342: Cisco Webex Meetings Desktop App for Mac Update Feature Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-18 · updated 2026-06-17
Weakness: CWE-295

Description

A 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.

Affected products

Cisco Webex Meetings: before 39.5.11 — fixed in 39.5.11

How to fix

Upgrade to a fixed version: Cisco Webex Meetings 39.5.11. Check the vendor advisory for mitigations.

References

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