CVE-2019-1748: Cisco IOS

High severity, CVSS 7.4. EPSS: 1.2% chance of exploitation in the next 30 days.

A vulnerability in the Cisco Network Plug-and-Play (PnP) agent of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to gain unauthorized access to sensitive data. The vulnerability exists because the affected software insufficiently validates certificates. An attacker could exploit this vulnerability by supplying a crafted certificate to an affected device. A successful exploit could allow the attacker to conduct man-in-the-middle attacks to decrypt and modify confidential information on user connections to the affected software.

Affected products

• Cisco IOS: version 12.0(1) only; version 12.0(1)t only; version 12.0(1)t1 only; version 12.0(1)xe only; version 12.0(1a) only; version 12.0(2) only; …
• Cisco IOS XE: version 3.3.0se only; version 3.3.0xo only; version 3.3.1se only; version 3.3.1xo only; version 3.3.2se only; version 3.3.2xo only; …

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