CVE-2026-3622

EUVD-2026-16419
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).
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 15%
Affected Products (NVD)
VendorProductVersion
tp-linktl-wr841n_firmware
𝑥
< 0.9.1_4.19
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.tp-link.com/en/support/download/tl-wr841n/v14/#Firmware
https://www.tp-link.com/us/support/download/tl-wr841n/v14/#Firmware
https://www.tp-link.com/us/support/faq/5033/