CVE-2021-1529 Cisco IOS XE SD-WAN Software Command Injection Vulnerability

What is CVE-2021-1529?

CVE-2021-1529 is a high-severity command injection vulnerability in Cisco Ios Xe, published on 21 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges. The vulnerability is due to insufficient input validation by the system CLI. An attacker could exploit this vulnerability by authenticating to an affected device and submitting crafted input to the system CLI. A successful exploit could allow the attacker to execute commands on the underlying operating system with root privileges.

Weakness: CWE-78

Which versions are affected by CVE-2021-1529?

It affects 2 products.

Products include Cisco Ios Xe, Cisco Ios Xe Sd-Wan.

How do I fix CVE-2021-1529?

No fix has been published for CVE-2021-1529 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-2021-1529 being exploited?

There is no known exploitation of CVE-2021-1529 in the wild and no public exploit code.

Other vulnerabilities in Cisco Ios Xe

• CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation Exploited Critical 10.0
• CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution Exploited Critical 9.8
• CVE-2023-20273 Cisco IOS XE Web UI Command Injection Exploited High 7.2
• CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software Critical 10.0
• CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability Critical 10.0

All Cisco Ios Xe vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-cg99-cxj5-wq75.