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CVE-2026-7548— Totolink NR1800X cstecgi.cgi sub_41A68C command injection

Quick assessment

Affected
Totolink NR1800X
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.

TOTOLINK NR1800X是中国吉翁电子（TOTOLINK）公司的一款出色的 5G NR 室内Wi-Fi和SIP CPE。旨在为家庭和办公室提供快速便捷的 NR 固定数据服务部署。 TOTOLINK NR1800X 9.1.0u.6279_B20210910版本存在注入漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中sub_41A68C函数对参数setUssd的操作，可能导致命令注入。

CVSS 8.8 · High EPSS 2.89% · P86

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink NR1800X 9.1.0u.6279_B20210910 affected
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I. Basic Information for CVE-2026-7548

Vulnerability Information
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Vulnerability Title
Totolink NR1800X cstecgi.cgi sub_41A68C command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Totolink NR1800X 9.1.0u.6279_B20210910. This affects the function sub_41A68C of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument setUssd results in command injection. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
TOTOLINK NR1800X 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK NR1800X是中国吉翁电子（TOTOLINK）公司的一款出色的 5G NR 室内Wi-Fi和SIP CPE。旨在为家庭和办公室提供快速便捷的 NR 固定数据服务部署。 TOTOLINK NR1800X 9.1.0u.6279_B20210910版本存在注入漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中sub_41A68C函数对参数setUssd的操作，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
Totolink NR1800X 9.1.0u.6279_B20210910 cpe:2.3:o:totolink:nr1800x_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7548

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: uid=0(root) gid=0(root) groups=0(root) — command injection confirmed in setUssd handler
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 7583 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-7548

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News Coverage for CVE-2026-7548 (1)

Same Patch Batch · Totolink · 2026-05-01 · 3 CVEs total

CVE-2026-7546 9.8 CRITICAL Totolink NR1800X lighttpd find_host_ip stack-based overflow
CVE-2026-7538 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi vulnerability os command injection

IV. Related Vulnerabilities

Same product: NR1800X
Same vendor: Totolink
Same weakness: CWE-77

V. Comments for CVE-2026-7548

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