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CVE-2026-1156— Totolink LR350 cstecgi.cgi setWiFiBasicCfg buffer overflow

Quick assessment

Affected
Totolink LR350
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 LR350是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK LR350 9.3.5u.6369_B20220309版本存在安全漏洞，该漏洞源于对文件/cgi-bin/cstecgi.cgi中参数ssid的错误操作，可能导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.72% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-1156

Vulnerability Information
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Vulnerability Title
Totolink LR350 cstecgi.cgi setWiFiBasicCfg buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Totolink LR350 9.3.5u.6369_B20220309. Affected by this issue is the function setWiFiBasicCfg of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument ssid causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.
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 LR350 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK LR350是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK LR350 9.3.5u.6369_B20220309版本存在安全漏洞，该漏洞源于对文件/cgi-bin/cstecgi.cgi中参数ssid的错误操作，可能导致缓冲区溢出。
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 LR350 9.3.5u.6369_B20220309 cpe:2.3:o:totolink:lr350_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-1156

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III. Intelligence Information for CVE-2026-1156

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Vendor Advisories for CVE-2026-1156 (1)

Same Patch Batch · Totolink · 2026-01-19 · 7 CVEs total

CVE-2026-1158 8.8 HIGH Totolink LR350 POST Request cstecgi.cgi setWizardCfg buffer overflow
CVE-2026-1157 8.8 HIGH Totolink LR350 cstecgi.cgi setWiFiEasyCfg buffer overflow
CVE-2026-1155 8.8 HIGH Totolink LR350 cstecgi.cgi setWiFiEasyGuestCfg buffer overflow
CVE-2026-1143 8.8 HIGH TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow
CVE-2026-1150 6.3 MEDIUM Totolink LR350 POST Request cstecgi.cgi setTracerouteCfg command injection
CVE-2026-1149 6.3 MEDIUM Totolink LR350 POST Request cstecgi.cgi setDiagnosisCfg command injection

IV. Related Vulnerabilities

Same product: LR350
Same vendor: Totolink
Same weakness: CWE-120

V. Comments for CVE-2026-1156

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