CVE-2026-124057

TOTOLINK CA300-PoE cstecgi.cgi setWiFiMultipleConfig buffer overflow

9.4 Critical

A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument Key1Str1 results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

What each source reports

CVE List Score used 9.4

TOTOLINK CA300-PoE cstecgi.cgi setWiFiMultipleConfig buffer overflow

Record: CVE-2026-124057
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C
CVSS 3.0: 9.1 CriticalCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C
CVSS 2.0: 8.3 AV:N/AC:L/Au:M/C:C/I:C/A:C/E:POC/RL:ND/RC:C
Weakness: CWE-120, CWE-119
Updated: 2026-11-07

EUVDEUVD-2026-119324 9.4

Record: EUVD-2026-119324
CVSS 4.0: 9.4 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Updated: 2026-11-07

GitHub AdvisoriesGHSA-5w7f-7pm8-j5vg 8.5

A security flaw has been discovered in TOTOLINK CA300-PoE 6.2c.884. This impacts the function...

Record: GHSA-5w7f-7pm8-j5vg
CVSS 4.0: 8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-07

NVD 8.5

Record: CVE-2026-124057
CVSS 4.0: 8.5 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0: 8.3 HighAV:N/AC:L/Au:M/C:C/I:C/A:C
Weakness: CWE-119, CWE-120
Updated: 2026-11-07

Affected products

totolink ca300-poe

History

History
Recorded	Changed	Sources
Nov 7, 2026	published	EUVD
Nov 7, 2026	published	EUVD, NVD
Nov 7, 2026	aliases, published	EUVD
Nov 7, 2026	aliases, references	GitHub Advisories
Nov 7, 2026	first indexed	CVE List

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-124057 is a critical vulnerability (CVSS 9.4) in Totolink Ca300-poe, published November 7, 2026. No source lists public exploit code. No source names a fixed version.