Vulnerability identifier: #VU49574

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1311

CWE-ID: CWE-307

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Webex Meetings
Server applications / Conferencing, Collaboration and VoIP solutions
Cisco WebEx Meetings Server
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to gain access to the system.

The vulnerability exists due to a lack of protection against brute forcing of the host key in the reclaim host role feature. A remote authenticated attacker can send specially crafted requests, launch a brute-force authentication attack and acquire or take over the host role for a meeting.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Webex Meetings: 40.10.1

Cisco WebEx Meetings Server: 3.0MR3 Patch 5 - 4.0MR3 Patch 4

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-brutef-hostkey-FWRMxVF

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.