CVE-2026-123959

CRITICAL 9.1

TOTOLINK CA300-PoE cstecgi.cgi setLanguageCfg buffer overflow

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. The impacted element is the function setLanguageCfg of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument langType results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

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:H/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/432022 vuldb.com: https://vuldb.com/vuln/432022/cti vuldb.com: https://vuldb.com/cve/CVE-2026-123959 vuldb.com: https://vuldb.com/submit/1033721 lavender-bicycle-a5a.notion.site: https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setLanguageCfg-3f953a41781f80199f44f227136a1441?source=copy_link totolink.net: https://www.totolink.net/

Credits

🔍 wxhwxhwxh_mie (VulDB User)