High severity · published Mar 26, 2026
CVE-2026-3622
Denial-of-Service Vulnerability in UPnP Component of TP Link's TL-WR841N
7.5
CVSS
0.4%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TV
TL-WR841N v14 · TP-Link Systems Inc.
before 0.9.1 4.19 · source: vendor
TF
Tl-wr841n Firmware · Tp-link
before 0.9.1_4.19 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3622
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3622
Product
https://www.tp-link.com/en/support/download/tl-wr841n/v14/#Firmware
Product
https://www.tp-link.com/us/support/download/tl-wr841n/v14/#Firmware
Vendor Advisory
https://www.tp-link.com/us/support/faq/5033/
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