TI-2026-86632 Aliases CVE-2026-124060 GHSA-2vw4-jgr3-g7qv

Buffer overflow in TOTOLINK CA300-PoE UploadCustomModule function

MEDIUM 56CWE-119Published 2026-11-07 · Updated 2026-11-07

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

TOTOLINK CA300-PoE version 6.2c.884 is affected. Manipulating the File argument of the UploadCustomModule function in /cgi-bin/cstecgi.cgi causes a buffer overflow (CWE-119). A remote attacker with high privileges can trigger it. The exploit is now public and may be used.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

A vulnerability was detected in TOTOLINK CA300-PoE 6.2c.884. Affected by this issue is the function UploadCustomModule of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument File results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used.

Why it matters now

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TOTOLINK	CA300-PoE	6.2c.884	—	No fix listed	CNA

CA300-PoE VendorTOTOLINK Affected 6.2c.884 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:totolink:ca300-poe_firmware::::::::	—	—	TOTOLINK

cpe:2.3:o:totolink:ca300-poe_firmware:*:*:*:*:*:*:*:* Versions — — ·TOTOLINK

Remediation

The sources list no fixed version for TOTOLINK CA300-PoE.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Timeline

2026-11-07 Threatist record created from CVE-2026-124060
2026-11-07 Alias added: GHSA-2vw4-jgr3-g7qv

References

Exploit 1

https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-UploadCustomModule-3f953a41781f803fabf6e4b901fffb1f?source=copy_link

Other 1

https://www.totolink.net/

TI-2023-25090 An issue in TOTOLINK A3700R v.9.1.2u.6165_20211012 allows a remote attacker to execute… CVSS 3.1CRITICAL 9.8
TI-2026-80926 TOTOLINK A950RG stack-based overflow in infostat.cgi via CONTENT_LENGTH CVSS 4.0CRITICAL 10.0
TI-2026-79142 Command injection in TOTOLINK A950RG UploadCustomModule function CVSS 4.0CRITICAL 10.0
TI-2026-79031 TOTOLINK EX200 setWiFiAclAddConfig stack-based buffer overflow CVSS 4.0CRITICAL 10.0
TI-2026-79012 Stack-based buffer overflow in TOTOLINK EX200 setStaticDhcpConfig CVSS 4.0CRITICAL 10.0
TI-2026-67719 Stack-based overflow in Totolink A3002MU QoS rule handler CVSS 4.0CRITICAL 10.0

See all 1317 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences