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CVE-2026-11451— GL.iNet GL-MT3000 FTP Protocol glc snprintf command injection

Quick assessment

Affected
GL.iNet GL-MT3000
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GL.iNet GL-MT3000是中国广联智通（GL.iNet）公司的一款支持Wi-Fi 6和VPN功能的便携式旅行路由器。 GL.iNet GL-MT3000 4.4.5版本存在命令注入漏洞，该漏洞源于FTP Protocol Handler组件文件/cgi-bin/glc中函数snprintf对参数media_dir的错误操作，可能导致命令注入。

CVSS 7.3 · High EPSS 2.03% · P80

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
GL.iNet GL-MT3000 4.4.5 affected
4.8.1 unaffected
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I. Basic Information for CVE-2026-11451

Vulnerability Information
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Vulnerability Title
GL.iNet GL-MT3000 FTP Protocol glc snprintf command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in GL.iNet GL-MT3000 4.4.5. This impacts the function snprintf of the file /cgi-bin/glc of the component FTP Protocol Handler. Executing a manipulation of the argument media_dir can lead to command injection. It is possible to launch the attack remotely. Upgrading to version 4.8.1 will fix this issue. You should upgrade the affected component. The vendor explains: "In version 4.8.1, before writing media_dir to the FTP configuration command, the code escapes single quotes using escape_single_quote(). The payloads in the report—which rely on closing a single quote, appending commands with a semicolon, and commenting out the tail with #—cannot escape execution under the current code path. We also verified this on a GL‑MT3000 device running firmware version 4.8.1 using similar payloads calling the /NAS_API_SET_PROTO_CONFIG interface. Although the interface returned success, the marker file intended to prove command execution was not created; the payload was written into /etc/vsftpd.conf only as ordinary configuration content and did not trigger any shell command execution. Therefore, with the current firmware version and default runtime environment, we could not reproduce the claimed “unauthorized command injection in set_proto_config”."
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
GL.iNet GL-MT3000 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GL.iNet GL-MT3000是中国广联智通（GL.iNet）公司的一款支持Wi-Fi 6和VPN功能的便携式旅行路由器。 GL.iNet GL-MT3000 4.4.5版本存在命令注入漏洞，该漏洞源于FTP Protocol Handler组件文件/cgi-bin/glc中函数snprintf对参数media_dir的错误操作，可能导致命令注入。
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
GL.iNet GL-MT3000 4.4.5 cpe:2.3:o:gl-inet:gl-mt3000_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-11451

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9648 chars
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POC zip download
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III. Intelligence Information for CVE-2026-11451

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Proof of Concept for CVE-2026-11451 (1)

Same Patch Batch · GL.iNet · 2026-06-07 · 6 CVEs total

CVE-2026-11452 7.3 HIGH GL.iNet GL-MT3000 SET_USER_PWD glc FUN_0042e200 command injection
CVE-2026-11450 7.3 HIGH GL.iNet GL-MT3000 Path Normalization dlopen command injection
CVE-2026-11449 6.3 MEDIUM GL.iNet GL-MT3000 LuCI JSON-RPC rpc rpc_sys command injection
CVE-2026-11447 6.3 MEDIUM GL.iNet GL-MT3000 MTK Backend iwinfo.so iwinfo_backend command injection
CVE-2026-11448 4.7 MEDIUM GL.iNet GL-MT3000 Minidlna Service rpc realpath command injection

IV. Related Vulnerabilities

Same product: GL-MT3000
Same vendor: GL.iNet
Same weakness: CWE-77

V. Comments for CVE-2026-11451

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