CVE-2021-1435 MEDIUM

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

Vendor Cisco
Product Cisco IOS XE Software
Weakness CWE-22 · Path traversal
Published March 24, 2021
Last update December 16, 2025
View on NVD All CVEs

CVSS base score

6.6/10
Attack vector Network
Attack complexity High
Privileges required High
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 24, 2021 CVE published
December 16, 2025 Record updated