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The bugs impact Cisco Jabber for Windows, macOS, and mobile platforms, and are not dependable to one another. To successfully exploit them, an attacker would need to be authenticated to an Extensible Messaging and Presence Protocol (XMPP) server in use by the affected software and to be able to send XMPP messages.
The most important of them is CVE-2021-1411, a critical arbitrary program execution flaw in Jabber for Windows, which exists because of improper validation of message content. Successful exploitation of this vulnerability could result in code execution, Cisco explains.