high
7.2
CWE
489
Advisory Published
Updated

CVE-2021-1391: Cisco IOS and IOS XE Software Privilege Escalation Vulnerability

First published: Wed Mar 24 2021(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS=12.2\(6\)i1
Cisco IOS=15.0\(2\)se13a
Cisco IOS=15.1\(3\)svr1
Cisco IOS=15.1\(3\)svr2
Cisco IOS=15.1\(3\)svr3
Cisco IOS=15.1\(3\)svs
Cisco IOS=15.1\(3\)svs1
Cisco IOS=15.2\(4\)ea10
Cisco IOS=15.2\(5\)e
Cisco IOS=15.2\(5\)e1
Cisco IOS=15.2\(5\)e2
Cisco IOS=15.2\(5\)e2b
Cisco IOS=15.2\(5\)e2c
Cisco IOS=15.2\(5\)ea
Cisco IOS=15.2\(5\)ex
Cisco IOS=15.2\(5a\)e
Cisco IOS=15.2\(5a\)e1
Cisco IOS=15.2\(5b\)e
Cisco IOS=15.2\(5c\)e
Cisco IOS=15.2\(6\)e
Cisco IOS=15.2\(6\)e0a
Cisco IOS=15.2\(6\)e0c
Cisco IOS=15.2\(6\)e1
Cisco IOS=15.2\(6\)e1a
Cisco IOS=15.2\(6\)e1s
Cisco IOS=15.2\(6\)e2
Cisco IOS=15.2\(6\)e2a
Cisco IOS=15.2\(6\)e2b
Cisco IOS=15.2\(6\)e3
Cisco IOS=15.2\(6\)eb
Cisco IOS=15.2\(7\)e
Cisco IOS=15.2\(7\)e0a
Cisco IOS=15.2\(7\)e0b
Cisco IOS=15.2\(7\)e0s
Cisco IOS=15.2\(7\)e1
Cisco IOS=15.2\(7\)e1a
Cisco IOS=15.2\(7\)e2
Cisco IOS=15.2\(7\)e2a
Cisco IOS=15.2\(7\)e2b
Cisco IOS=15.2\(7\)e3
Cisco IOS=15.2\(7\)e3k
Cisco IOS=15.2\(7a\)e0b
Cisco IOS=15.2\(7b\)e0b
Cisco IOS=15.3\(3\)jf13
Cisco IOS XE Software=3.9.0e
Cisco IOS XE Software=3.9.1e
Cisco IOS XE Software=3.9.2be
Cisco IOS XE Software=3.9.2e
Cisco IOS XE Software=3.10.0ce
Cisco IOS XE Software=3.10.0e
Cisco IOS XE Software=3.10.1ae
Cisco IOS XE Software=3.10.1e
Cisco IOS XE Software=3.10.1se
Cisco IOS XE Software=3.10.2e
Cisco IOS XE Software=3.10.3e
Cisco IOS XE Software=3.11.0e
Cisco IOS XE Software=3.11.1ae
Cisco IOS XE Software=3.11.1e
Cisco IOS XE Software=3.11.2ae
Cisco IOS XE Software=3.11.2e
Cisco IOS XE Software=3.11.3ae
Cisco IOS XE Software=3.11.3e
Cisco IOS XE Software=16.8.1
Cisco IOS XE Software=16.8.1a
Cisco IOS XE Software=16.8.1b
Cisco IOS XE Software=16.8.1c
Cisco IOS XE Software=16.8.1d
Cisco IOS XE Software=16.8.1e
Cisco IOS XE Software=16.8.1s
Cisco IOS XE Software=16.8.2
Cisco IOS XE Software=16.8.3
Cisco IOS XE Software=16.9.1
Cisco IOS XE Software=16.9.1a
Cisco IOS XE Software=16.9.1b
Cisco IOS XE Software=16.9.1c
Cisco IOS XE Software=16.9.1d
Cisco IOS XE Software=16.9.1s
Cisco IOS XE Software=16.9.2
Cisco IOS XE Software=16.9.2a
Cisco IOS XE Software=16.9.2s
Cisco IOS XE Software=16.9.3
Cisco IOS XE Software=16.9.3a
Cisco IOS XE Software=16.9.3h
Cisco IOS XE Software=16.9.3s
Cisco IOS XE Software=16.9.4
Cisco IOS XE Software=16.9.4c
Cisco IOS XE Software=16.9.5
Cisco IOS XE Software=16.9.5f
Cisco IOS XE Software=16.9.6
Cisco IOS XE Software=16.10.1
Cisco IOS XE Software=16.10.1a
Cisco IOS XE Software=16.10.1b
Cisco IOS XE Software=16.10.1c
Cisco IOS XE Software=16.10.1d
Cisco IOS XE Software=16.10.1e
Cisco IOS XE Software=16.10.1f
Cisco IOS XE Software=16.10.1g
Cisco IOS XE Software=16.10.1s
Cisco IOS XE Software=16.10.2
Cisco IOS XE Software=16.10.3
Cisco IOS XE Software=16.11.1
Cisco IOS XE Software=16.11.1a
Cisco IOS XE Software=16.11.1b
Cisco IOS XE Software=16.11.1c
Cisco IOS XE Software=16.11.1s
Cisco IOS XE Software=16.11.2
Cisco IOS XE Software=16.12.1
Cisco IOS XE Software=16.12.1a
Cisco IOS XE Software=16.12.1c
Cisco IOS XE Software=16.12.1s
Cisco IOS XE Software=16.12.1t
Cisco IOS XE Software=16.12.1w
Cisco IOS XE Software=16.12.1x
Cisco IOS XE Software=16.12.1y
Cisco IOS XE Software=16.12.1z
Cisco IOS XE Software=16.12.1za
Cisco IOS XE Software=16.12.2
Cisco IOS XE Software=16.12.2a
Cisco IOS XE Software=16.12.2s
Cisco IOS XE Software=16.12.2t
Cisco IOS XE Software=16.12.3
Cisco IOS XE Software=16.12.3a
Cisco IOS XE Software=16.12.3s
Cisco IOS XE Software=17.1.1
Cisco IOS XE Software=17.1.1a
Cisco IOS XE Software=17.1.1s
Cisco IOS XE Software=17.1.1t
Cisco IOS XE Software=17.1.2
Cisco IOS XE Software=17.2.1
Cisco IOS XE Software=17.2.1a
Cisco IOS XE Software=17.2.1r
Cisco IOS XE Software=17.2.1v
Cisco IOS XE Software=17.2.2
Cisco IOS XE Software=17.2.3

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-1391?

    CVE-2021-1391 has been assigned a high CVSS score indicating significant potential impact.

  • How do I fix CVE-2021-1391?

    To fix CVE-2021-1391, upgrade to a fixed version of Cisco IOS XE software as recommended by Cisco.

  • Who is affected by CVE-2021-1391?

    CVE-2021-1391 affects authenticated users with local access to Cisco IOS XE devices running specific versions.

  • What types of attacks are possible with CVE-2021-1391?

    CVE-2021-1391 allows attackers to escalate privileges from level 15 to root, potentially compromising the device.

  • Is CVE-2021-1391 exploitable remotely?

    CVE-2021-1391 is not exploitable remotely as it requires authenticated local access to the affected device.

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