CVE-2026-123958

CRITICAL 9.9

TOTOLINK CA300-PoE cstecgi.cgi setLanConfig buffer overflow

CVSS Score

9.9

EPSS Score

0.0%

EPSS Percentile

0th

A vulnerability was identified in TOTOLINK CA300-PoE 6.2c.884. The affected element is the function setLanConfig of the file /cgi-bin/cstecgi.cgi. Such manipulation of the argument lanDns/lanSecDns/langType leads to buffer overflow. It is possible to launch the attack remotely. The exploit is publicly available and might be used.

CWE	CWE-120 CWE-119
Vendor	totolink
Product	ca300-poe
Published	Nov 7, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

TOTOLINK / CA300-PoE

6.2c.884

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/432021 vuldb.com: https://vuldb.com/vuln/432021/cti vuldb.com: https://vuldb.com/cve/CVE-2026-123958 vuldb.com: https://vuldb.com/submit/1033673 lavender-bicycle-a5a.notion.site: https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setLanConfig-3f953a41781f8029941cd21d2cc16db0?source=copy_link totolink.net: https://www.totolink.net/

Credits

🔍 wxhwxhwxh_mie (VulDB User)