CVE-2020-3230: Cisco IOS

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) implementation in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent IKEv2 from establishing new security associations. The vulnerability is due to incorrect handling of crafted IKEv2 SA-Init packets. An attacker could exploit this vulnerability by sending crafted IKEv2 SA-Init packets to the affected device. An exploit could allow the attacker to cause the affected device to reach the maximum incoming negotiation limits and prevent further IKEv2 security associations from being formed.

Affected products

• Cisco IOS: version 12.2(6)i1 only; version 15.0(2)ej only; version 15.0(2)ej1 only; version 15.0(2)ek only; version 15.0(2)ek1 only; version 15.0(2)ex only; …
• Cisco IOS XE: version 3.3.0sg only; version 3.3.0xo only; version 3.3.1sg only; version 3.3.1xo only; version 3.3.2sg only; version 3.3.2xo only; …

Published 2020-06-03. Last modified 2026-06-17.