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CVE-2026-19846— TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules 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firewall.so中文件/cgi-bin/cstecgi.cgi内setUrlFilterRules函数对url参数的处理不当，可能导致栈缓冲区溢出，攻击者可远程发起攻击。

CVSS 8.8 · High EPSS 0.85% · P57 Updated Aug 15, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
TOTOLINK	A800R	`4.1.2cu.5137_B20200730`	affected

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I. Basic Information for CVE-2026-19846

Vulnerability Information

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Vulnerability Title

TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability was identified in TOTOLINK A800R 4.1.2cu.5137_B20200730. This impacts the function setUrlFilterRules of the file /cgi-bin/cstecgi.cgi of the component firewall.so. The manipulation of the argument url leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit is publicly available and might 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

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

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-2026-19846

#	POC Description	Source Link	Shenlong Link

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Qwen3.6-35B-A3B · 11098 chars

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III. Intelligence Information for CVE-2026-19846

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Vendor Advisories for CVE-2026-19846 (2)

Submit #869456: Totolink A800R V4.1.2cu.5137_B20200730 Buffer Overflow third-party-advisory
CVE-2026-19846 TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow vdb-entry technical-description

News Coverage for CVE-2026-19846 (2)

🔗 vuls/totolink/a800r/setUrlFilterRules.md at main · panda666-888/vuls · GitHub Read full article exploit
CVE-2026-19846 in A800R third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-19846

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-2026-19847	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-2026-19846

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-19846— TOTOLINK A800R firewall.so cstecgi.cgi setUrlFilterRules stack-based overflow

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 1

I. Basic Information for CVE-2026-19846

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-19846

III. Intelligence Information for CVE-2026-19846

Vendor Advisories for CVE-2026-19846 (2)

News Coverage for CVE-2026-19846 (2)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-19846

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