CVE-2013-6979: Cisco IOS XE

Medium severity, CVSS 5.4. EPSS: 3.6% chance of exploitation in the next 30 days.

The VTY authentication implementation in Cisco IOS XE 03.02.xxSE and 03.03.xxSE incorrectly relies on the Linux-IOS internal-network configuration, which allows remote attackers to bypass authentication by leveraging access to a 192.168.x.2 source IP address, aka Bug ID CSCuj90227.

Affected products

• Cisco IOS XE: affected versions not specified

Published 2013-12-23. Last modified 2026-06-17.