Zero-Day Advisory

Fortinet Discovers Cisco WebEx Products Memory Corruption Vulnerability


Fortinet's FortiGuard Labs has discovered a memory corruption vulnerability in Cisco WebEx products.

Cisco WebEx Network Recording Player and WebEx Player are free tools to watch, share, and edit Cisco WebEx recordings developed and published by Cisco Systems for macOS and Windows.

A memory corruption vulnerability has been discovered in these Cisco WebEx products. The vulnerability exists because the vulnerable software can't correctly parse a crafted arf file which causes an out-of-bounds memory access. It could allow malicious users to create remote code execution scenarios.


FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:

Released Apr 12, 2021

Users should apply the solution provided by Cisco Systems.


Fortinet reported the vulnerability to Cisco Systems on February 08, 2021. 

Cisco Systems confirmed the vulnerability on February 24, 2021.

Cisco Systems patched the vulnerability on June 02, 2021.


This vulnerability was discovered by Kushal Arvind Shah of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.