CVE-2024-20433: Cisco IOS

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in the Resource Reservation Protocol (RSVP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a buffer overflow when processing crafted RSVP packets. An attacker could exploit this vulnerability by sending RSVP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Affected products

• Cisco IOS: version 12.0(24)s only; version 12.0(24)s1 only; version 12.0(24)s2 only; version 12.0(24)s2a only; version 12.0(24)s2b only; version 12.0(24)s3 only; …
• Cisco IOS XE: version 3.3.0sg only; version 3.3.1sg only; version 3.3.2sg only; version 3.4.0sg only; version 3.4.1sg only; version 3.4.2sg only; …

Published 2024-09-25. Last modified 2026-06-17.