CVE-2026-3841— Command Injection Vulnerability in Telnet CLI on TP-Link TL-MR6400
Quick assessment
Affected
TP-Link Systems Inc. TL-MR6400 v5.3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
TP-Link TL-MR6400是中国普联（TP-Link）公司的一款无线路由器。 TP-Link TL-MR6400 v5.3版本存在安全漏洞，该漏洞源于Telnet CLI中数据清理不足，可能导致命令注入攻击。
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I. Basic Information for CVE-2026-3841
Vulnerability Information
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Vulnerability Title
Command Injection Vulnerability in Telnet CLI on TP-Link TL-MR6400
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
TP-Link TL-MR6400 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-Link TL-MR6400是中国普联（TP-Link）公司的一款无线路由器。 TP-Link TL-MR6400 v5.3版本存在安全漏洞，该漏洞源于Telnet CLI中数据清理不足，可能导致命令注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| TP-Link Systems Inc. | TL-MR6400 v5.3 | 0 ~ 1.9.0 Build 260108 | - |
|
II. Public POCs for CVE-2026-3841
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-3841 (1)
Vendor Pages for CVE-2026-3841 (1)
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