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CVE-2026-4346

Cleartext Storage of Administrative and Wi-Fi Credentials via Accessible Serial Interface in TP Link's TL-WR850N

Published: Mar 26, 2026Updated: Mar 31, 2026 Sources: CVE List NVDCWE-312
NVD MITRE
6.8CVSSMEDIUM
EPSS Score
0.1%
Top 97.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

The vulnerability affecting TL-WR850N v3 allows cleartext storage of administrative and Wi-Fi credentials in a region of the device’s flash memory while the serial interface remains enabled and protected by weak authentication. An attacker with physical access and the ability to connect to the serial port can recover sensitive information, including the router’s management password and wireless network key. Successful exploitation can lead to full administrative control of the device and unauthorized access to the associated wireless network.

CVSS Vector Breakdown

AV:PAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:PAttack Vector
Physical
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-312

Affected Products

TL-WR850N v3TP-Link Systems Inc.Networking Infrastructure
tl-wr850n 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
Credential Access
View detailed technique mapping

References

https://www.tp-link.com/in/support/download/tl-wr850n/#Firmware
tp-link.com
https://www.tp-link.com/us/support/faq/5034/
tp-link.com

Timeline

Published
Mar 26, 2026
Last Updated
Mar 31, 2026

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