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CVE-2026-7748— Totolink N300RH POST Request cstecgi.cgi setUpgradeFW 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POST Request Handler中文件/cgi-bin/cstecgi.cgi的函数setUpgradeFW对参数FileName操作导致缓冲区溢出，攻击者可远程执行攻击。

CVSS 8.8 · High EPSS 0.79% · P55

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-2026-7748

Vulnerability Information
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Vulnerability Title
Totolink N300RH POST Request cstecgi.cgi setUpgradeFW buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Totolink N300RH 3.2.4-B20220812. Affected by this issue is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. Executing a manipulation of the argument FileName can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.
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
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POST Request Handler中文件/cgi-bin/cstecgi.cgi的函数setUpgradeFW对参数FileName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)

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-2026-7748

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III. Intelligence Information for CVE-2026-7748

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Security Blog Posts for CVE-2026-7748 (1)

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

CVE-2026-7747 9.8 CRITICAL Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow
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-2026-7717 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-2026-7748

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