Cisco security advisory

Number: AV21-471
Date: 23 September 2021

On 22 September 2021 Cisco published Security Advisories to address vulnerabilities in multiple products. Included were critical updates for the following:

  • Cisco IOS XE SD-WAN Software on:
    • 1000 Series Integrated Services Routers (ISRs)
    • 4000 Series ISRs
    • ASR 1000 Series Aggregation Services Routers
    • Cloud Services Router 1000V Series
  • Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers on:
    • Catalyst 9800 Embedded Wireless Controller for Catalyst 9300, 9400, and 9500 Series Switches
    • Catalyst 9800 Series Wireless Controllers
    • Catalyst 9800-CL Wireless Controllers for Cloud
    • Embedded Wireless Controller on Catalyst Access Points
  • Cisco IOS XE Software – certain configurations
  • Cisco IOS XE SD-WAN Software – certain configurations

Exploitation of these vulnerabilities could result in arbitrary code execution, authentication bypass or denial-of-service.

The Cyber Centre encourages users and administrators to review the provided web link and apply the necessary updates.

Cisco Security Advisories
https://tools.cisco.com/security/center/publicationListing.x

Note to Readers

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment. We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.

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