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CVE-2026-109506

MEDIUMCVSS 5.9/10EPSS 0.35%

Last modified

CVE-2026-109506 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. Multiple TP-Link Wi-Fi range extenders use a custom, reversible XOR-and-dictionary transformation in the HTTP web-management login flow. An unauthenticated attacker on the same local network who can capture the network traffic associated with legitimate administrator login may be able to derive an alternative credential value that produces the same accepted authentication result and use it to authenticate to the device’s web-management interface with administrator privileges. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

Multiple TP-Link Wi-Fi range extenders use a custom, reversible XOR-and-dictionary transformation in the HTTP web-management login flow. An unauthenticated attacker on the same local network who can capture the network traffic associated with legitimate administrator login may be able to derive an alternative credential value that produces the same accepted authentication result and use it to authenticate to the device’s web-management interface with administrator privileges. Exploitation requires the management login to use HTTP and the attacker to observe the session key, dictionary, and login value associated with a legitimate administrator login. Successful exploitation may allow an unauthenticated adjacent attacker to gain administrator access to the affected device and modify exposed configuration settings.

Metrics

CVSS 4.0
5.9/10

CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability
0.35%

26.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
TP-Link Systems Inc.RE190 v5< V5_260904
TP-Link Systems Inc.RE200 v5< V5_260904
TP-Link Systems Inc.RE205 v4< V4_260904
TP-Link Systems Inc.RE215 v1< V1_260904
TP-Link Systems Inc.RE220 v3< V3_260904
TP-Link Systems Inc.RE230 v2< V2_260904
TP-Link Systems Inc.RE300 v2< V2_260904
TP-Link Systems Inc.RE305 v4< V4_260904
TP-Link Systems Inc.RE330 v1< V1_260904
TP-Link Systems Inc.RE335 v1< V1_260904
TP-Link Systems Inc.RE365 v2< V2_260904
TP-Link Systems Inc.RE365 v3< V3_260904
TP-Link Systems Inc.RE750C v4< V4_260904
TP-Link Systems Inc.RE450 v4.8< V4_260915
TP-Link Systems Inc.RE550 v1< V1_260915
TP-Link Systems Inc.RE315 v1< V1_260904 rel3959

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2026-109506?
Multiple TP-Link Wi-Fi range extenders use a custom, reversible XOR-and-dictionary transformation in the HTTP web-management login flow. An unauthenticated attacker on the same local network who can capture the network traffic associated with legitimate administrator login may be able to derive an alternative credential value that produces the same accepted authentication result and use it to authenticate to the device’s web-management interface with administrator privileges. Exploitation requires the management login to use HTTP and the attacker to observe the session key, dictionary, and login value associated with a legitimate administrator login. Successful exploitation may allow an unauthenticated adjacent attacker to gain administrator access to the affected device and modify exposed configuration settings.
How severe is CVE-2026-109506?
CVE-2026-109506 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2026-109506?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST