CVE-2026-3622: TP-Link TL-WR841N Firmware

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service. Successful exploitation can cause the UPnP service to crash, resulting in a Denial-of-Service condition.  This vulnerability affects TL-WR841N v14 < EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303) and < US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304).

Affected products

• TP-Link TL-WR841N Firmware: before 0.9.1_4.19 (fixed in 0.9.1_4.19)

Published 2026-03-26. Last modified 2026-06-17.