TOTOLINK CA300-PoE: Buffer overflow in UploadCustomModule (CVE-2026-124060)
A buffer overflow vulnerability exists in the UploadCustomModule function of the TOTOLINK CA300-PoE (version 6.2c.884) file /cgi-bin/cstecgi.cgi. The vulnerability is remotely exploitable via the File argument.
CVE search metadata
CVE search record: CVE-2026-124060. Severity: critical. CVSS: 9.1. KEV: no. Product: CA300-PoE (6.2c.884). Brief: TOTOLINK CA300-PoE: Buffer overflow in UploadCustomModule (CVE-2026-124060). Brief link: https://feed.craftedsignal.io/briefs/2026-11-totolink-buffer-overflow-4b90d979/
Triage facts
Revision 1- Applicability
- CA300-PoE (6.2c.884)
- Evidence
- Unknown
- Severity
- Critical
- Sources
- 1 public source
- Freshness
- Revision 1Nov 7, 22:45 UTC
- Vulnerabilities
- 1 CVE
- Source quality
- A2Roughly even chance
A buffer overflow vulnerability was detected in the TOTOLINK CA300-PoE firmware version 6.2c.884. The issue resides in the UploadCustomModule function within the /cgi-bin/cstecgi.cgi file. The vulnerability can be triggered remotely by manipulating the 'File' argument. Public exploit information is available.