CVE-2026-3841 Command Injection Vulnerability in Telnet CLI on TP-Link TL-MR6400
An authenticated attacker with elevated privileges can execute arbitrary system commands via the Telnet CLI, leading to full device compromise.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3841?
CVE-2026-3841 is a high-severity command injection vulnerability in TP-Link Systems Inc. TL-MR6400 v5.3, published on 12 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A command injection vulnerability has been identified in the Telnet command-line interface (CLI) of TP-Link TL-MR6400 v5.3. This issue is caused by insufficient sanitization of data processed during specific CLI operations. An authenticated attacker with elevated privileges may be able to execute arbitrary system commands. Successful exploitation may lead to full device compromise, including potential loss of confidentiality, integrity, and availability.
Weakness: CWE-78
Which versions are affected by CVE-2026-3841?
It affects 1 product.
Products include Tp-Link Tl-Mr6400 Firmware.
How do I fix CVE-2026-3841?
No fix has been published for CVE-2026-3841 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-3841 being exploited?
There is no known exploitation of CVE-2026-3841 in the wild and no public exploit code.
Sources
Also known as GHSA-ppr5-j2r8-wqw5.