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Fencer Vulns
high 8.7

CVE-2026-11834 json

Unauthenticated Command Injection via DHCP Option Handling in Multiple TP-Link Routers

published 2026-06-22 4 mo ago modified 2026-06-26 4 mo ago also EUVD-2026-38339

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

A command injection vulnerability has been identified in the DHCP option processing logic in multiple TP-Link router models, due to insufficient validation of externally supplied DHCP option data. An adjacent attacker may exploit this vulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized command execution during device initialization or provisioning workflows. This typically occurs when the device is in a factory-default or unconfigured state.

Successful exploitation may allow an adjacent, unauthenticated attacker to execute arbitrary commands with elevated privileges, potentially leading to full compromise of the affected device and unauthorized administrative control.

Patch / fix

  • TP-Link Systems Inc. Archer MR200 v07 1.3.0 Build 250605
  • TP-Link Systems Inc. Archer MR200 v8 1.5.0 Build 260605
  • TP Link Systems Inc. Archer MR402 v1 1.5.0 Build 260605
  • TP-Link Systems Inc. Archer VR2100 v1 EU_V1_260330
  • TP-Link Systems Inc. Archer C20 v5 EU_V5_260317, US_V5_260419
  • TP-Link Systems Inc. Archer C20 v6 V6_260608
  • TP-Link Systems Inc. TL-MR6400 v7 1.7.0 Build 260413

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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. Archer MR200 v07
  • TP-Link Systems Inc. Archer MR200 v8
  • TP Link Systems Inc. Archer MR402 v1
  • TP-Link Systems Inc. Archer VR2100 v1
  • TP-Link Systems Inc. Archer C20 v5
  • TP-Link Systems Inc. Archer C20 v6
  • TP-Link Systems Inc. TL-MR6400 v7

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns 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.