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CVE-2026-82616— TOTOLINK NR1800X cstecgi.cgi setUploadSetting 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 firmware是中国TOTOLINK公司的一款网络设备产品。 TOTOLINK nr1800x firmware 9.1.0u.6681_B20230703版本存在缓冲区错误漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中setUploadSetting函数对参数FileName操作导致栈缓冲区溢出，攻击者可能远程利用该漏洞。

CVSS 9.9 · Critical EPSS 0.85% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
TOTOLINK NR1800X 9.1.0u.6681_B20230703 affected
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I. Basic Information for CVE-2026-82616

Vulnerability Information
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Vulnerability Title
TOTOLINK NR1800X cstecgi.cgi setUploadSetting stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in TOTOLINK NR1800X 9.1.0u.6681_B20230703. Impacted is the function setUploadSetting of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument FileName results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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 firmware 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK nr1800x firmware是中国TOTOLINK公司的一款网络设备产品。 TOTOLINK nr1800x firmware 9.1.0u.6681_B20230703版本存在缓冲区错误漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中setUploadSetting函数对参数FileName操作导致栈缓冲区溢出，攻击者可能远程利用该漏洞。
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.6681_B20230703 cpe:2.3:o:totolink:nr1800x_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82616

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III. Intelligence Information for CVE-2026-82616

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Other References for CVE-2026-82616 (4)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-82616

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