CVE-2019-1758: Cisco IOS

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in 802.1x function of Cisco IOS Software on the Catalyst 6500 Series Switches could allow an unauthenticated, adjacent attacker to access the network prior to authentication. The vulnerability is due to how the 802.1x packets are handled in the process path. An attacker could exploit this vulnerability by attempting to connect to the network on an 802.1x configured port. A successful exploit could allow the attacker to intermittently obtain access to the network.

Affected products

• Cisco IOS: version 12.2(33)sxj6 only; version 12.2(33)sxj7 only; version 12.2(33)sxj8 only; version 12.2(33)sxj9 only; version 12.2(33)sxj10 only; version 12.2(60)ez12 only; …

Published 2019-03-28. Last modified 2026-06-17.