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CVE-2026-124059— TOTOLINK CA300-PoE cstecgi.cgi setWiFiWdsAddConfig 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 6.2c.884 固件中发现一处安全漏洞。该漏洞影响位于文件中的函数。攻击者可通过操纵参数触发缓冲区溢出。此攻击可远程发起。利用代码已公开披露，可被实际利用。

CVSS 9.1 · Critical Updated Nov 08, 2026

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 setWiFiWdsAddConfig buffer overflow

Source: CVE Program / CVE List V5

Vulnerability Description

A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this vulnerability is the function setWiFiWdsAddConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ApCliKeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

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-2026-124059

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-124059

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Vendor Advisories for CVE-2026-124059 (1)

CVE-2026-124059 | TOTOLINK CA300-PoE 6.2c.884 /cgi-bin/cstecgi.cgi setWiFiWdsAddConfig ApCliKeyStr buffer overflow vdb-entry technical-description

Other References for CVE-2026-124059 (4)

https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiWdsAddConfig-3f953a41781f80488243d24703fa0365?source=copy_link exploit
https://vuldb.com/cve/CVE-2026-124059 third-party-advisory
https://vuldb.com/vuln/432114/cti signature permissions-required
https://vuldb.com/submit/1033756 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-124059

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-2026-124058	9.1 CRITICAL	TOTOLINK CA300-PoE cstecgi.cgi setWiFiRepeaterConfig buffer overflow

IV. Related Vulnerabilities

Same product: CA300-PoE

Same vendor: TOTOLINK

Same weakness: CWE-120