CVE-2026-3227
Authenticated Command Injection on TP-Link TL-WR802N, TL-WR841N and TL-WR840N
- Published
- Mar 13, 2026
- Updated
- Jul 1, 2026
- Assigning CNA
- TPLink
- Evidence observed
- Aug 5, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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:XLow · next 30 days
- Percentile
- 78.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
A command injection vulnerability was identified in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 due to improper neutralization of special elements used in an OS command. In the router configuration import function allows an authenticated attacker to upload a crafted configuration file that results in execution of OS commands with root privileges during port-trigger processing. Successful exploitation allows an authenticated attacker to execute system commands with root privileges, leading to full device compromise.
Sources
1Proof-of-concept for authenticated OS command injection in TP-Link router firmware. Includes decryption, QEMU-based encryption hook, and 15-character payload generation for persistent bootloop or backdoor deployment.
Responsible use
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