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CVE-2026-19847— TOTOLINK A800R wps.so cstecgi.cgi setWiFiWpsConfig stack-based 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TOTOLINK公司的一款无线路由器。 TOTOLINK A800R 4.1.2cu.5137_B20200730版本存在缓冲区错误漏洞，该漏洞源于组件wps.so中setWiFiWpsConfig函数对参数pin的处理不当，导致栈缓冲区溢出，攻击者可能利用该漏洞发起远程攻击。

CVSS 8.8 · High EPSS 0.85% · P57

Affected Version Matrix 1

VendorProduct Version RangeStatus
TOTOLINK A800R 4.1.2cu.5137_B20200730 affected
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I. Basic Information for CVE-2026-19847

Vulnerability Information
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Vulnerability Title
TOTOLINK A800R wps.so cstecgi.cgi setWiFiWpsConfig stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in TOTOLINK A800R 4.1.2cu.5137_B20200730. Affected is the function setWiFiWpsConfig of the file /cgi-bin/cstecgi.cgi of the component wps.so. The manipulation of the argument pin results in stack-based buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may 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
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK A800R 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A800R是中国TOTOLINK公司的一款无线路由器。 TOTOLINK A800R 4.1.2cu.5137_B20200730版本存在缓冲区错误漏洞，该漏洞源于组件wps.so中setWiFiWpsConfig函数对参数pin的处理不当，导致栈缓冲区溢出，攻击者可能利用该漏洞发起远程攻击。
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 A800R 4.1.2cu.5137_B20200730 cpe:2.3:o:totolink:a800r_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19847

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III. Intelligence Information for CVE-2026-19847

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Vendor Advisories for CVE-2026-19847 (1)

Other References for CVE-2026-19847 (3)

Same Patch Batch · TOTOLINK · 2026-08-14 · 9 CVEs total

CVE-2026-19811 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setIpQosRules stack-based overflow
CVE-2026-19812 8.8 HIGH TOTOLINK A800R product.so cstecgi.cgi UploadCustomModule stack-based overflow
CVE-2026-19813 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setMacFilterRules stack-based overflow
CVE-2026-19814 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setMacQos stack-based overflow
CVE-2026-19815 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setParentalRules stack-based overflow
CVE-2026-19844 8.8 HIGH TOTOLINK A800R ipv6.so cstecgi.cgi setRadvdCfg stack-based overflow
CVE-2026-19845 8.8 HIGH TOTOLINK A800R lan.so cstecgi.cgi setStaticDhcpConfig stack-based overflow
CVE-2026-19846 8.8 HIGH TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow

IV. Related Vulnerabilities

Same product: A800R
Same vendor: TOTOLINK
Same weakness: CWE-121

V. Comments for CVE-2026-19847

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