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CVE-2026-19812— TOTOLINK A800R product.so cstecgi.cgi UploadCustomModule stack-based overflow

Quick assessment

Affected
TOTOLINK A800R
Exploitation
Public or AI PoC available; prioritize validation
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product.so的文件/cgi-bin/cstecgi.cgi中UploadCustomModule函数对参数File的操作导致栈缓冲区溢出，攻击者可远程利用该漏洞。

CVSS 8.8 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
TOTOLINK A800R 4.1.2cu.5137_B20200730 affected
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I. Basic Information for CVE-2026-19812

Vulnerability Information
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Vulnerability Title
TOTOLINK A800R product.so cstecgi.cgi UploadCustomModule stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This affects the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi of the component product.so. This manipulation of the argument File causes stack-based buffer overflow. The attack is possible to be carried out remotely. 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: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product.so的文件/cgi-bin/cstecgi.cgi中UploadCustomModule函数对参数File的操作导致栈缓冲区溢出，攻击者可远程利用该漏洞。
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-2026-19812

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 6776 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-19812

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News Coverage for CVE-2026-19812 (1)

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-2026-19813 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
CVE-2026-19847 8.8 HIGH TOTOLINK A800R wps.so cstecgi.cgi setWiFiWpsConfig stack-based overflow

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-19812

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