CVE-2021-23242: Mercusys Mercury x18g Firmware

Medium severity, CVSS 5.3. EPSS: 1.8% chance of exploitation in the next 30 days.

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.

Affected products

• Mercusys Mercury x18g Firmware: version 1.0.5 only

Published 2021-01-07. Last modified 2026-06-17.