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On September 2nd, 2020, Cisco announced a series of high impact vulnerabilities affecting the Cisco Jabber video conferencing platform . The most serious vulnerability is CVE-2020-3495, which allows for arbitrary code execution. To exploit CVE-2020-3495 an attacker would need sufficient access to send messages to Jabber clients. This vulnerability is considered wormable, meaning that an exploit could be created to automatically spread malicious content to other vulnerable systems.
Organizations are encouraged to apply security patches after performing a business impact review.
What we’re doing about it
What you should do about it
The vulnerability stems from improper validation of message contents. In an attack scenario, a threat actor who has already achieved initial access could send a maliciously crafted Extensible Messaging and Presence Protocol (XMPP) message to internal Jabber users. After receiving the message, no user interaction is required.
CVE-2020-3495 affects versions 12.1 – 12.9 of the Jabber client for Windows. Exploitation of the vulnerability has not been identified in the wild at this time.
Additional Cisco Jabber Vulnerabilities: