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CVE-2026-124057— TOTOLINK CA300-PoE cstecgi.cgi setWiFiMultipleConfig buffer overflow

Quick assessment

Affected

TOTOLINK CA300-PoE

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 CA300-PoE 固件版本 6.2c.884 中发现了一个安全漏洞。该漏洞影响文件中的函数。攻击者通过篡改参数可触发缓冲区溢出。此攻击可远程发起，且利用代码已向公众公开，可能被用于实施攻击。

CVSS 9.1 · Critical Updated Nov 08, 2026

Possible ATT&CK Techniques 2 AI

T1068.001 T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
TOTOLINK	CA300-PoE	`6.2c.884`	affected

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Vulnerability Information

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Vulnerability Title

TOTOLINK CA300-PoE cstecgi.cgi setWiFiMultipleConfig buffer overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument Key1Str1 results in buffer overflow. The attack can be initiated 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:H/UI:N/S:C/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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
TOTOLINK	CA300-PoE	6.2c.884	`cpe:2.3:o:totolink:ca300-poe_firmware::::::::`

II. Public POCs for CVE-2026-124057

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-124057

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Vendor Advisories for CVE-2026-124057 (1)

CVE-2026-124057 | TOTOLINK CA300-PoE 6.2c.884 /cgi-bin/cstecgi.cgi setWiFiMultipleConfig Key1Str1 buffer overflow vdb-entry technical-description

Other References for CVE-2026-124057 (4)

https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiMultipleConfig-3f953a41781f800fab65eaa6a2887fa1?source=copy_link exploit
https://vuldb.com/cve/CVE-2026-124057 third-party-advisory
https://vuldb.com/vuln/432112/cti signature permissions-required
https://vuldb.com/submit/1033754 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-124057

Same Patch Batch · TOTOLINK · 2026-11-07 · 8 CVEs total

CVE-2026-123957	9.9 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow
CVE-2026-123958	9.9 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setLanConfig buffer overflow
CVE-2026-123960	9.9 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setWanConfig buffer overflow
CVE-2026-123961	9.9 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow
CVE-2026-123959	9.1 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setLanguageCfg buffer overflow
CVE-2026-124058	9.1 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setWiFiRepeaterConfig buffer overflow
CVE-2026-124059	9.1 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setWiFiWdsAddConfig buffer overflow

IV. Related Vulnerabilities

Same product: CA300-PoE

Same vendor: TOTOLINK

Same weakness: CWE-120