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CVE-2026-124058— TOTOLINK CA300-PoE cstecgi.cgi setWiFiRepeaterConfig 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.

在 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。攻击者可通过篡改参数触发缓冲区溢出。该攻击可远程发起，且相关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 setWiFiRepeaterConfig buffer overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A weakness has been identified in TOTOLINK CA300-PoE 6.2c.884. Affected is the function setWiFiRepeaterConfig of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ApCliKeyStr can lead to buffer overflow. The attack can be launched 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: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-2026-124058

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-124058

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Vendor Advisories for CVE-2026-124058 (1)

CVE-2026-124058 | TOTOLINK CA300-PoE 6.2c.884 /cgi-bin/cstecgi.cgi setWiFiRepeaterConfig ApCliKeyStr buffer overflow vdb-entry technical-description

Other References for CVE-2026-124058 (4)

https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiRepeaterConfig-3f953a41781f80349879d9aca7c4702a?source=copy_link exploit
https://vuldb.com/cve/CVE-2026-124058 third-party-advisory
https://vuldb.com/vuln/432113/cti signature permissions-required
https://vuldb.com/submit/1033755 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-124058

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-2026-124057	9.1 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setWiFiMultipleConfig 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