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CVE-2026-6157— Totolink A800R app.so setAppEasyWizardConfig buffer overflow

Quick assessment

Affected
Totolink A800R
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 A800R是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A800R 4.1.2cu.5137_B20200730版本存在安全漏洞，该漏洞源于对库文件/lib/cste_modules/app.so中参数apcliSsid的错误操作，可能导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.47% · P39
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I. Basic Information for CVE-2026-6157

Vulnerability Information
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Vulnerability Title
Totolink A800R app.so setAppEasyWizardConfig buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Totolink A800R 4.1.2cu.5137_B20200730. This impacts the function setAppEasyWizardConfig in the library /lib/cste_modules/app.so. The manipulation of the argument apcliSsid results in buffer overflow. The attack can be executed 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: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 A800R 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A800R是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A800R 4.1.2cu.5137_B20200730版本存在安全漏洞，该漏洞源于对库文件/lib/cste_modules/app.so中参数apcliSsid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 A800R 4.1.2cu.5137_B20200730 cpe:2.3:o:totolink:a800r_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-6157

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III. Intelligence Information for CVE-2026-6157

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Proof of Concept for CVE-2026-6157 (1)

Same Patch Batch · Totolink · 2026-04-13 · 11 CVEs total

CVE-2026-6195 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi setPasswordCfg os command injection
CVE-2026-6156 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi setIpQosRules os command injection
CVE-2026-6155 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi setWanCfg os command injection
CVE-2026-6154 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi setWizardCfg os command injection
CVE-2026-6140 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi UploadFirmwareFile os command injection
CVE-2026-6139 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi UploadOpenVpnCert os command injection
CVE-2026-6138 9.8 CRITICAL Totolink A7100RU CGI cstecgi.cgi setAccessDeviceCfg os command injection
CVE-2026-6194 8.8 HIGH Totolink A3002MU HTTP Request formWlanSetup sub_410188 stack-based overflow
CVE-2026-6168 8.8 HIGH TOTOLINK A7000R cstecgi.cgi setWiFiEasyGuestCfg stack-based overflow
CVE-2026-6158 7.3 HIGH Totolink N300RH upgrade.so setUpgradeUboot os command injection

IV. Related Vulnerabilities

Same product: A800R
Same vendor: Totolink
Same weakness: CWE-120

V. Comments for CVE-2026-6157

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