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CVE-2026-7218— Totolink N300RT libapmib.so formWsc is_cmd_string_valid buffer overflow

Quick assessment

Affected
Totolink N300RT
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 N300RT是中国吉翁电子（TOTOLINK）公司的一款符合 802.11n 标准的无线路由器。 TOTOLINK N300RT 3.4.0-B20250430版本存在缓冲区错误漏洞，该漏洞源于libapmib.so组件中/boafrm/formWsc文件的is_cmd_string_valid函数的localPin参数存在缓冲区溢出，可能导致远程攻击。

CVSS 7.2 · High EPSS 0.84% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink N300RT 3.4.0-B20250430 affected
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I. Basic Information for CVE-2026-7218

Vulnerability Information
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Vulnerability Title
Totolink N300RT libapmib.so formWsc is_cmd_string_valid buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Totolink N300RT 3.4.0-B20250430. The impacted element is the function is_cmd_string_valid of the file /boafrm/formWsc of the component libapmib.so. Performing a manipulation of the argument localPin results in buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/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 N300RT 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK N300RT是中国吉翁电子（TOTOLINK）公司的一款符合 802.11n 标准的无线路由器。 TOTOLINK N300RT 3.4.0-B20250430版本存在缓冲区错误漏洞，该漏洞源于libapmib.so组件中/boafrm/formWsc文件的is_cmd_string_valid函数的localPin参数存在缓冲区溢出，可能导致远程攻击。
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 N300RT 3.4.0-B20250430 cpe:2.3:o:totolink:n300rt_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7218

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III. Intelligence Information for CVE-2026-7218

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Proof of Concept for CVE-2026-7218 (1)

Same Patch Batch · Totolink · 2026-04-28 · 9 CVEs total

CVE-2026-7203 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setUrlFilterRules os command injection
CVE-2026-7204 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setPptpServerCfg os command injection
CVE-2026-7240 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setVpnAccountCfg os command injection
CVE-2026-7241 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setWiFiBasicCfg os command injection
CVE-2026-7242 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setOpenVpnClientCfg os command injection
CVE-2026-7243 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setRadvdCfg os command injection
CVE-2026-7244 9.8 CRITICAL Totolink A8000RU CGI cstecgi.cgi setWiFiEasyGuestCfg os command injection
CVE-2026-7219 7.2 HIGH Totolink N300RT formIpQoS buffer overflow

IV. Related Vulnerabilities

Same product: N300RT
Same vendor: Totolink
Same weakness: CWE-120

V. Comments for CVE-2026-7218

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