CVE-2021-1435 Cisco IOS XE Software Web UI Command Injection Vulnerability

Medium 6.6 Published 24 Mar 2021 Updated 16 Dec 2025

Authenticated attackers can inject arbitrary commands into the Cisco IOS XE web UI to execute code with root privileges.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-1435?

CVE-2021-1435 is a medium-severity command injection vulnerability in Cisco Ios Xe, published on 24 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A vulnerability in the web UI of Cisco IOS XE Software could allow an authenticated, remote attacker to inject arbitrary commands that can be executed as the root user. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted request to the web UI of an affected device with arbitrary commands injected into a portion of the request. A successful exploit could allow the attacker to execute arbitrary commands as the root user.

Weakness: CWE-22

Which versions are affected by CVE-2021-1435?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2021-1435?

No fix has been published for CVE-2021-1435 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2021-1435 being exploited?

There is no known exploitation of CVE-2021-1435 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-5rv2-fphg-fgcg.