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CVE-2026-7720— Totolink WA300 POST Request cstecgi.cgi setLanguageCfg command injection

Quick assessment

Affected
Totolink WA300
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 WA300是中国吉翁电子（TOTOLINK）公司的一款无线接入点。 Totolink WA300 5.2cu.7112_B20190227版本存在注入漏洞，该漏洞源于POST Request Handler组件中文件/cgi-bin/cstecgi.cgi的函数setLanguageCfg对参数langType的操作导致命令注入，攻击者可通过远程发起攻击。

CVSS 6.3 · Medium EPSS 1.77% · P77

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink WA300 5.2cu.7112_B20190227 affected
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I. Basic Information for CVE-2026-7720

Vulnerability Information
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Vulnerability Title
Totolink WA300 POST Request cstecgi.cgi setLanguageCfg command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Totolink WA300 5.2cu.7112_B20190227. The impacted element is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. This manipulation of the argument langType causes command injection. Remote exploitation of the attack is possible. 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:L/I:L/A:L
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 WA300 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK WA300是中国吉翁电子（TOTOLINK）公司的一款无线接入点。 Totolink WA300 5.2cu.7112_B20190227版本存在注入漏洞，该漏洞源于POST Request Handler组件中文件/cgi-bin/cstecgi.cgi的函数setLanguageCfg对参数langType的操作导致命令注入，攻击者可通过远程发起攻击。
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 WA300 5.2cu.7112_B20190227 cpe:2.3:o:totolink:wa300_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7720

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III. Intelligence Information for CVE-2026-7720

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Security Blog Posts for CVE-2026-7720 (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-2026-7748 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-2026-7718 6.3 MEDIUM Totolink WA300 POST Request cstecgi.cgi setWebWlanIdx command injection

IV. Related Vulnerabilities

Same product: WA300
Same vendor: Totolink
Same weakness: CWE-77

V. Comments for CVE-2026-7720

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