CVE-2024-20276: Cisco IOS

High severity, CVSS 7.4. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in Cisco IOS Software for Cisco Catalyst 6000 Series Switches could allow an unauthenticated, adjacent attacker to cause an affected device to reload unexpectedly. This vulnerability is due to improper handling of process-switched traffic. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.

Affected products

• Cisco IOS: version 15.5(1)sy5 only; version 15.5(1)sy6 only; version 15.5(1)sy7 only; version 15.5(1)sy8 only; version 15.5(1)sy9 only; version 15.5(1)sy10 only; …

Published 2024-03-27. Last modified 2026-06-17.