CVE-2015-6343: Cisco IOS

Medium severity, CVSS 5.0. EPSS: 2% chance of exploitation in the next 30 days.

The SIP implementation in Cisco IOS 15.5(3)M on Cisco Unified Border Element (CUBE) devices allows remote attackers to cause a denial of service via crafted SIP messages, aka Bug ID CSCuv79202.

Affected products

• Cisco IOS: version 15.5(3)m only

Published 2015-10-31. Last modified 2026-06-17.