Ref# ADV2026_190 | Date: Mar 26th 2026

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Cisco published a security advisory highlighting vulnerabilities in the following products on March 25, 2026. It is recommended that you take the necessary precautions by ensuring your products are always updated.

• Cisco Catalyst 9300 Series Switches
• Cisco Catalyst 9200 Series Switches
• Cisco Catalyst 9000 Series Switches
• Cisco Catalyst ESS9300 Embedded Series Switches
• Cisco IOS Software
• Cisco IOS XE Software
• Cisco Secure Firewall ASA Software
• Cisco Secure FTD Software
• Cisco Catalyst IE9310 and IE9320 Rugged Series Switches
• Cisco IE3500 and IE3505 Rugged Series Switches
• Cisco Catalyst CW9800H Wireless Controllers
• Cisco Catalyst CW9800M Wireless Controllers
• Cisco Catalyst CW9800H1 Wireless Controllers
• Cisco Meraki MS390
• Cisco Catalyst SD-WAN Manager

For more information on these updates, you can follow this URL:

• Cisco Security Advisories

The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.

PDF Download: Cisco Security Advisory

References

• Cisco Security Advisory (March 25^th, 2026). Retrieved from Cisco. https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75297

Cisco Security Advisory (March 25th, 2026). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/cisco-security-advisory-av26-281