CVE-2026-3622 Denial-of-Service Vulnerability in UPnP Component of TP Link's TL-WR841N
An out-of-bounds read in the UPnP component allows attackers to crash the service, causing a denial of service on TP-Link routers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3622?
CVE-2026-3622 is a high-severity denial of service vulnerability in TP-Link Systems Inc. TL-WR841N v14, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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).
Weakness: CWE-125
Which versions are affected by CVE-2026-3622?
It affects 1 product.
Products include Tp-Link Tl-Wr841n Firmware.
How do I fix CVE-2026-3622?
No fix has been published for CVE-2026-3622 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-3622 being exploited?
There is no known exploitation of CVE-2026-3622 in the wild and no public exploit code.
Other vulnerabilities in TP-Link Systems Inc. TL-WR841N v14
Sources
Also known as GHSA-hhj2-6q7v-v5hc.