CVE-2021-20040: sonicwall sma_200_firmware Relative Path Traversal

Vulnerability summary

CVE-2021-20040 is a high (CVSS 7.5) Relative Path Traversal vulnerability in sonicwall sma_200_firmware. EPSS estimates a 25.15% chance of exploitation in the next 30 days, higher than 97.9% of scored vulnerabilities.

Timeline

1. 08-12-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

A relative path traversal vulnerability in the SMA100 upload funtion allows a remote unauthenticated attacker to upload crafted web pages or files as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

• CWE-23Relative Path TraversalThe product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
• 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.