CVE-2018-11714: TP-Link Tl-WR840N Firmware

Critical severity, CVSS 9.8. EPSS: 68.1% chance of exploitation in the next 30 days.

An issue was discovered on TP-Link TL-WR840N v5 00000005 0.9.1 3.16 v0001.0 Build 170608 Rel.58696n and TL-WR841N v13 00000013 0.9.1 4.16 v0001.0 Build 170622 Rel.64334n devices. This issue is caused by improper session handling on the /cgi/ folder or a /cgi file. If an attacker sends a header of "Referer: http://192.168.0.1/mainFrame.htm" then no authentication is required for any action.

Affected products

• TP-Link Tl-WR840N Firmware: version 0.9.1_3.16 only
• TP-Link TL-WR841N Firmware: version 0.9.1_4.16 only

Published 2018-06-04. Last modified 2026-06-17.