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CVE-2026-7546— Totolink NR1800X lighttpd find_host_ip stack-based overflow

Quick assessment

Affected
Totolink NR1800X
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.

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版本存在缓冲区错误漏洞，该漏洞源于lighttpd组件中find_host_ip函数对参数Host的操作，可能导致栈缓冲区溢出。

CVSS 9.8 · Critical EPSS 1.02% · P62

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink NR1800X 9.1.0u.6279_B20210910 affected
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I. Basic Information for CVE-2026-7546

Vulnerability Information
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Vulnerability Title
Totolink NR1800X lighttpd find_host_ip stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in Totolink NR1800X 9.1.0u.6279_B20210910. The impacted element is the function find_host_ip of the component lighttpd. Such manipulation of the argument Host leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK NR1800X 缓冲区错误漏洞
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版本存在缓冲区错误漏洞，该漏洞源于lighttpd组件中find_host_ip函数对参数Host的操作，可能导致栈缓冲区溢出。
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)

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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-2026-7546

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III. Intelligence Information for CVE-2026-7546

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Other References for CVE-2026-7546 (1)

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

CVE-2026-7538 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi vulnerability os command injection
CVE-2026-7548 8.8 HIGH Totolink NR1800X cstecgi.cgi sub_41A68C command injection

IV. Related Vulnerabilities

Same product: NR1800X
Same vendor: Totolink
Same weakness: CWE-121

V. Comments for CVE-2026-7546

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