CVE-2015-6280: Cisco IOS

High severity, CVSS 9.3. EPSS: 4.4% chance of exploitation in the next 30 days.

The SSHv2 functionality in Cisco IOS 15.2, 15.3, 15.4, and 15.5 and IOS XE 3.6E before 3.6.3E, 3.7E before 3.7.1E, 3.10S before 3.10.6S, 3.11S before 3.11.4S, 3.12S before 3.12.3S, 3.13S before 3.13.3S, and 3.14S before 3.14.1S does not properly implement RSA authentication, which allows remote attackers to obtain login access by leveraging knowledge of a username and the associated public key, aka Bug ID CSCus73013.

Affected products

• Cisco IOS: version 15.2(1)sy only; version 15.2(1)sy0a only; version 15.2(2)e only; version 15.2(2)e1 only; version 15.2(2)e2 only; version 15.2(2)ea1 only; …
• Cisco IOS XE: version 3.6e.0 only; version 3.6e.0a only; version 3.6e.0b only; version 3.6e.1 only; version 3.6e.2 only; version 3.6e.2a only; …

Published 2015-09-28. Last modified 2026-06-17.