High severity7.8NVD Advisory· Published Oct 21, 2021· Updated Jun 17, 2026

CVE-2021-1529

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./iOS Xe2 versions
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*range: >=16.12,<=17.0
- cpe:2.3:o:cisco:ios_xe:17.6.0:*:*:*:*:*:*:*
Cisco Systems, Inc./Ios Xe Sd Wan
cpe:2.3:o:cisco:ios_xe_sd-wan:*:*:*:*:*:*:*:*
Range: >=17.2.1r
Cisco Systems, Inc./IOS XE SD-WAN Softwarellm-fuzzy
Cisco Systems, Inc./IOS XE Software for Cisco Merakicpe-rescue
Range: n/a

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-rhpbE34AnvdVendor Advisory

News mentions

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