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Fencer Intel
medium 5.9

CVE-2026-109506 json

Improper Authentication in Multiple TP-Link WiFi Repeaters

published 26d ago modified 25d ago also EUVD-2026-101602

cvss
5.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
25d ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 5.9 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
CNA 4.0 5.9 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

Affected products

  • TP-Link Systems Inc. RE190 v5
  • TP-Link Systems Inc. RE200 v5
  • TP-Link Systems Inc. RE205 v4
  • TP-Link Systems Inc. RE215 v1
  • TP-Link Systems Inc. RE220 v3
  • TP-Link Systems Inc. RE230 v2
  • TP-Link Systems Inc. RE300 v2
  • TP-Link Systems Inc. RE305 v4
  • TP-Link Systems Inc. RE330 v1
  • TP-Link Systems Inc. RE335 v1
  • TP-Link Systems Inc. RE365 v2
  • TP-Link Systems Inc. RE365 v3
  • TP-Link Systems Inc. RE750C v4
  • TP-Link Systems Inc. RE450 v4.8
  • TP-Link Systems Inc. RE550 v1
  • TP-Link Systems Inc. RE315 v1

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.