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AUSCERT External Security Bulletin Redistribution
Cisco Webex Meetings, Webex Network Recording Player, and
Webex Teams DLL Injection Vulnerability
3 June 2021
AusCERT Security Bulletin Summary
Product: Webex Meetings Desktop App
Webex Meetings Server
Webex Network Recording Player
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2021-1536
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Cisco Webex Meetings, Webex Network Recording Player, and Webex Teams DLL
Advisory ID: cisco-sa-webex-dll-inject-XNmcSGTU
First Published: 2021 June 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw48667 CSCvw79311 CSCvw79321
CVE Names: CVE-2021-1536
o A vulnerability in Cisco Webex Meetings Desktop App for Windows, Cisco
Webex Meetings Server, Cisco Webex Network Recording Player for Windows,
and Cisco Webex Teams for Windows could allow an authenticated, local
attacker to perform a DLL injection attack on an affected device. To
exploit this vulnerability, the attacker must have valid credentials on the
This vulnerability is due to incorrect handling of directory paths at run
time. An attacker could exploit this vulnerability by inserting a
configuration file in a specific path in the system, which can cause a
malicious DLL file to be loaded when the application starts. A successful
exploit could allow the attacker to execute arbitrary code on the affected
system with the privileges of another user account.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
Webex Meetings Desktop App for Windows
Webex Meetings Server
Webex Network Recording Player for Windows
Webex Teams for Windows
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o There are no workarounds that address this vulnerability.
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table(s):
Cisco Webex Platform First Fixed Release
Webex Meetings Desktop App for Windows 18.104.22.168
Webex Meetings Server 3.0 MR4
Webex Network Recording Player for Windows 22.214.171.124
Webex Teams for Windows 126.96.36.19937
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
o Cisco would like to thank Xavier Danest of Decathlon for reporting this
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2021-JUN-02 |
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