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CVE-2026-3622

Denial-of-Service Vulnerability in UPnP Component of TP Link's TL-WR841N

Published: Mar 26, 2026Updated: Mar 31, 2026 Sources: CVE List NVDCWE-125
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 72.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-125

Affected Products

TL-WR841N v14TP-Link Systems Inc.Networking Infrastructure
tl-wr841n firmwaretp-linkNetworking Infrastructure
tp-link systems inc.commercialCNNetworking Infrastructureaka tp-link
tp-linkcommercialTWNetworking Infrastructureaka tp-link, tp link

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://www.tp-link.com/en/support/download/tl-wr841n/v14/#Firmware
tp-link.com
https://www.tp-link.com/us/support/download/tl-wr841n/v14/#Firmware
tp-link.com
https://www.tp-link.com/us/support/faq/5033/
tp-link.com

Timeline

Published
Mar 26, 2026
Last Updated
Mar 31, 2026

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