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CVE-2026-7747— Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow

Quick assessment

Affected
Totolink N300RH
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 N300RH是中国吉翁电子（TOTOLINK）公司的一款长距离无线路由器。 TOTOLINK N300RH 3.2.4-B20220812版本存在缓冲区错误漏洞，该漏洞源于组件Parameter Handler中文件/cgi-bin/cstecgi.cgi的函数loginauth对参数Password操作导致缓冲区溢出，攻击者可远程执行攻击。

CVSS 9.8 · Critical EPSS 1.02% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink N300RH 3.2.4-B20220812 affected
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I. Basic Information for CVE-2026-7747

Vulnerability Information
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Vulnerability Title
Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in Totolink N300RH 3.2.4-B20220812. Affected by this vulnerability is the function loginauth of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. Performing a manipulation of the argument Password results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
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
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK N300RH 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK N300RH是中国吉翁电子（TOTOLINK）公司的一款长距离无线路由器。 TOTOLINK N300RH 3.2.4-B20220812版本存在缓冲区错误漏洞，该漏洞源于组件Parameter Handler中文件/cgi-bin/cstecgi.cgi的函数loginauth对参数Password操作导致缓冲区溢出，攻击者可远程执行攻击。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Totolink N300RH 3.2.4-B20220812 cpe:2.3:o:totolink:n300rh_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7747

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III. Intelligence Information for CVE-2026-7747

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Proof of Concept for CVE-2026-7747 (1)

Same Patch Batch · Totolink · 2026-05-04 · 9 CVEs total

CVE-2026-7719 9.8 CRITICAL Totolink WA300 POST Request cstecgi.cgi loginauth buffer overflow
CVE-2026-7750 8.8 HIGH Totolink N300RH POST Request cstecgi.cgi setMacFilterRules buffer overflow
CVE-2026-7749 8.8 HIGH Totolink N300RH POST Request cstecgi.cgi setWanConfig buffer overflow
CVE-2026-7748 8.8 HIGH Totolink N300RH POST Request cstecgi.cgi setUpgradeFW buffer overflow
CVE-2026-7717 8.8 HIGH Totolink WA300 POST Request cstecgi.cgi UploadCustomModule buffer overflow
CVE-2026-7721 6.3 MEDIUM Totolink WA300 cstecgi.cgi NTPSyncWithHost command injection
CVE-2026-7720 6.3 MEDIUM Totolink WA300 POST Request cstecgi.cgi setLanguageCfg command injection
CVE-2026-7718 6.3 MEDIUM Totolink WA300 POST Request cstecgi.cgi setWebWlanIdx command injection

IV. Related Vulnerabilities

Same product: N300RH
Same vendor: Totolink
Same weakness: CWE-120

V. Comments for CVE-2026-7747

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