Description
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.
Published: 2026-11-07
Score: 9.4 Critical
EPSS: n/a
KEV: No
Impact: Remote Code Execution
Action: Immediate Patch
AI Analysis

Impact

A buffer overflow flaw exists in the setWiFiMultipleConfig function of /cgi-bin/cstecgi.cgi in TOTOLINK CA300‑PoE firmware 6.2c.884. Manipulation of the argument Key1Str1 overflows a buffer, which can lead to arbitrary code execution on the device. The weakness is categorized as CWE‑119 and CWE‑120. The flaw can be triggered remotely, and an exploit has already been released to the public; the CVSS score of 9.4 reflects the severe impact of potential compromise.

Affected Systems

TOTOLINK CA300‑PoE devices running firmware version 6.2c.884 are affected. No other vendors or products are noted in the CNA data.

Risk and Exploitability

The vulnerability has a high severity CVSS score of 9.4 and is publicly exploitable through a remote HTTP request to /cgi-bin/cstecgi.cgi. The EPSS score is not available, but the absence of a KEV listing does not change the fact that the exploit is public. Attackers with network access to the device can craft a malicious request to trigger the buffer overflow, potentially achieving full control of the device.

Generated by OpenCVE AI on November 7, 2026 at 19:21 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Update the device firmware to the latest release from TOTOLINK that addresses the setWiFiMultipleConfig vulnerability.
  • Restrict access to the web interface by limiting inbound connections to trusted networks or specific IP addresses.
  • Deploy network intrusion detection to monitor for malformed requests targeting /cgi-bin/cstecgi.cgi and block suspicious traffic.

Generated by OpenCVE AI on November 7, 2026 at 19:21 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Sat, 07 Nov 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Title TOTOLINK CA300-PoE cstecgi.cgi setWiFiMultipleConfig buffer overflow
First Time appeared Totolink
Totolink ca300-poe Firmware
Weaknesses CWE-119
CWE-120
CPEs cpe:2.3:o:totolink:ca300-poe_firmware:*:*:*:*:*:*:*:*
Vendors & Products Totolink
Totolink ca300-poe Firmware
References
Metrics cvssV2_0

{'score': 8.3, 'vector': 'AV:N/AC:L/Au:M/C:C/I:C/A:C/E:POC/RL:ND/RC:C'}

cvssV3_0

{'score': 9.1, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C'}

cvssV3_1

{'score': 9.1, 'vector': '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'}

cvssV4_0

{'score': 9.4, 'vector': 'CVSS: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'}

Subscriptions

Totolink Ca300-poe Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-11-07T17:45:21.624Z

Reserved: 2026-11-06T19:53:48.220Z

Link: CVE-2026-124057

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-07T18:17:21.607

Modified: 2026-11-07T18:17:21.780

Link: CVE-2026-124057

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-07T19:30:07Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer

  • CWE-120

    Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')