CVE-2016-6398: Cisco IOS

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

The PPTP server in Cisco IOS 15.5(3)M does not properly initialize packet buffers, which allows remote attackers to obtain sensitive information from earlier network communication by reading packet data, aka Bug ID CSCvb16274.

Affected products

• Cisco IOS: version 15.5(3)m only

Published 2016-09-12. Last modified 2026-06-17.