CVE-2021-1391: Cisco IOS

Medium severity, CVSS 6.7. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in the dragonite debugger of Cisco IOS XE Software could allow an authenticated, local attacker to escalate from privilege level 15 to root privilege. The vulnerability is due to the presence of development testing and verification scripts that remained on the device. An attacker could exploit this vulnerability by bypassing the consent token mechanism with the residual scripts on the affected device. A successful exploit could allow the attacker to escalate from privilege level 15 to root privilege.

Affected products

• Cisco IOS: version 12.2(6)i1 only; version 15.0(2)se13a only; version 15.1(3)svr1 only; version 15.1(3)svr2 only; version 15.1(3)svr3 only; version 15.1(3)svs only; …
• Cisco IOS XE: version 3.9.0e only; version 3.9.1e only; version 3.9.2be only; version 3.9.2e only; version 3.10.0ce only; version 3.10.0e only; …

Published 2021-03-24. Last modified 2026-06-17.