critical
advisory
TOTOLINK CA300-PoE: Buffer overflow vulnerability in setWanConfig (CVE-2026-123960)
A buffer overflow vulnerability exists in the setWanConfig function of the TOTOLINK CA300-PoE 6.2c.884 firmware, which can be triggered remotely.
CVE search metadata
CVE search record: CVE-2026-123960. Severity: critical. CVSS: 9.9. KEV: no. Product: TOTOLINK CA300-PoE 6.2c.884. Brief: TOTOLINK CA300-PoE: Buffer overflow vulnerability in setWanConfig (CVE-2026-123960). Brief link: https://feed.craftedsignal.io/briefs/2026-11-totolink-buffer-overflow-51db86fb/
Triage facts
Revision 1- Applicability
- TOTOLINK CA300-PoE 6.2c.884
- Evidence
- Unknown
- Severity
- Critical
- Sources
- 1 public source
- Freshness
- Revision 1Nov 7, 16:54 UTC
- Vulnerabilities
- 1 CVE
- Source quality
- A2Roughly even chance
A weakness has been identified in TOTOLINK CA300-PoE 6.2c.884 within the setWanConfig function of /cgi-bin/cstecgi.cgi. Manipulation of the pppoeUser, priDns, or secDns arguments can lead to a buffer overflow. This attack can be launched remotely, and public exploit code is available.