CVE-2021-23241: mercusys mercury_x18g_firmware Path Traversal

Vulnerability summary

CVE-2021-23241 is a medium (CVSS 5.3) Path Traversal vulnerability in mercusys mercury_x18g_firmware. EPSS estimates a 13.33% chance of exploitation in the next 30 days, higher than 96.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 07-01-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with a loginLess or login.htm URI (for authentication bypass) to the web server, as demonstrated by the /loginLess/../../etc/passwd URI.

• 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.