CVE-2021-1435: cisco cisco ios xe software Path Traversal

Vulnerability summary

CVE-2021-1435 is a high (CVSS 9.0) Path Traversal vulnerability in cisco cisco ios xe software. EPSS estimates a 8.54% chance of exploitation in the next 30 days, higher than 95% of scored vulnerabilities.

Timeline

1. 24-03-2021
   PublishedVulnerability first disclosed.
2. 16-12-2025
   Last modifiedVulnerability information updated.

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.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.