What is CVE-2021-34729?

CVE-2021-34729 is a medium-severity vulnerability in Cisco iOS Xe Sd-Wan Software, classified under Command Injection. CVSS score: 6.7/10. Published 2021-09-23.

How severe is CVE-2021-34729?

Medium severity. CVSS v3 base score is 6.7 out of 10.

RCE in Cisco iOS Xe Sd-Wan Software

CVE-2021-34729

A vulnerability in the CLI of Cisco IOS XE SD-WAN Software and Cisco IOS XE Software could allow an authenticated, local attacker to execute arbitrary commands with elevated privileges on an affected device. This vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input in the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands with elevated privileges on the underlying operating system. An attacker would need valid user credentials to exploit this vulnerability.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-09-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.3th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ioxesdwa… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-34729?: CVE-2021-34729 is a medium-severity vulnerability in Cisco iOS Xe Sd-Wan Software, classified under Command Injection. CVSS score: 6.7/10. Published 2021-09-23.
How severe is CVE-2021-34729?: Medium severity. CVSS v3 base score is 6.7 out of 10.