What is CVE-2021-34726?

CVE-2021-34726 is a vulnerability in the CLI of Cisco SD-WAN Software that allows an authenticated local attacker to inject arbitrary commands with root-level privileges.

How does CVE-2021-34726 affect Cisco SD-WAN Software?

CVE-2021-34726 affects Cisco SD-WAN Software versions up to 20.5.1, allowing an authenticated local attacker to execute arbitrary commands as a privileged user.

What is the severity of CVE-2021-34726?

CVE-2021-34726 has a severity rating of 6.7 (high).

How can I fix CVE-2021-34726?

To fix CVE-2021-34726, it is recommended to upgrade Cisco SD-WAN Software to version 20.5.1 or later.

Where can I find more information about CVE-2021-34726?

More information about CVE-2021-34726 can be found in the Cisco Security Advisory at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-maapi-cmdinjec-znUYTuC.

Vulnerability/
CVE-2021-34726

high

7.2

CWE

78 77 20

22/9/2021

4/8/2024

CVE-2021-34726: Cisco SD-WAN Software Command Injection Vulnerability

First published: Wed Sep 22 2021(Updated: )

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to inject arbitrary commands to be executed with root-level privileges on the underlying operating system of an affected device. This vulnerability is due to insufficient input validation on certain CLI commands. An attacker could exploit this vulnerability by authenticating to an affected device and submitting crafted input to the CLI. The attacker must be authenticated as an administrative user to execute the affected commands. A successful exploit could allow the attacker to execute commands with root-level privileges.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco SD-WAN	<18.4.6
Cisco SD-WAN	>=19.2.0<19.2.3
Cisco SD-WAN	>=20.1<20.1.2
Cisco SD-WAN	>=20.3<20.3.1
Cisco SD-WAN	>=20.4<20.4.1
Cisco SD-WAN	>=20.5<20.5.1

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-maapi-cmdinjec-znUYTuC

Frequently Asked Questions

What is CVE-2021-34726?
CVE-2021-34726 is a vulnerability in the CLI of Cisco SD-WAN Software that allows an authenticated local attacker to inject arbitrary commands with root-level privileges.
How does CVE-2021-34726 affect Cisco SD-WAN Software?
CVE-2021-34726 affects Cisco SD-WAN Software versions up to 20.5.1, allowing an authenticated local attacker to execute arbitrary commands as a privileged user.
What is the severity of CVE-2021-34726?
CVE-2021-34726 has a severity rating of 6.7 (high).
How can I fix CVE-2021-34726?
To fix CVE-2021-34726, it is recommended to upgrade Cisco SD-WAN Software to version 20.5.1 or later.
Where can I find more information about CVE-2021-34726?
More information about CVE-2021-34726 can be found in the Cisco Security Advisory at https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-maapi-cmdinjec-znUYTuC.

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vendor/cisco
canonical/cisco sd-wan
version/cisco sd-wan/19.2.0
version/cisco sd-wan/20.1
version/cisco sd-wan/20.3
version/cisco sd-wan/20.4
version/cisco sd-wan/20.5

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