CVE-2022-20661: Cisco IOS

Medium severity, CVSS 4.6. EPSS: 0.2% chance of exploitation in the next 30 days.

Multiple vulnerabilities that affect Cisco Catalyst Digital Building Series Switches and Cisco Catalyst Micro Switches could allow an attacker to execute persistent code at boot time or to permanently prevent the device from booting, resulting in a permanent denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.

Affected products

• Cisco IOS: from 15.2\(5\)ex, before 15.2\(7\)e5 (fixed in 15.2\(7\)e5); version 15.2(8)e only

Published 2022-04-15. Last modified 2026-06-17.