CVE-2026-123961

Description

A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

Overview

State: PUBLISHED
Assigner (CNA): VulDB
CVSS severity: CRITICAL
CVSS score: 9.4 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Effective score: 9.4 / 10 CRITICAL source: CNA overview
CWE(s): CWE-120, CWE-119
Reserved: 2026-11-06
Published: 2026-11-07 10:15 UTC
Last updated: 2026-11-07 10:15 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/123xxx/CVE-2026-123961.json
Linked Threat: CVE-2026-123961 — TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-119099

EUVD enrichment is queued; refresh the page in a few seconds.

Affected products (1)

Vendor	Product	Versions	Platforms
TOTOLINK	CA300-PoE	`6.2c.884` (affected)	—

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

VDB-432024 | TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow vdb-entrytechnical-description
VDB-432024 | CTI Indicators (IOB, IOC, IOA) signaturepermissions-required
CVE-2026-123961 | CVE Analysis and Report third-party-advisory
Submit #1033753 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow third-party-advisory
https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiBasicConfig-3f953a41781f8098a6e8d808cb1a3ffd?source=copy_link exploit
https://www.totolink.net/ product

MITRE references (6) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setWiFiBasicConfig-3f953a41781f8098a6e8d808cb1a3ffd?source=copy_link exploit
CVE-2026-123961 | CVE Analysis and Report third-party-advisory
Submit #1033753 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow third-party-advisory
VDB-432024 | TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow vdb-entry, technical-description
VDB-432024 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
https://www.totolink.net/ product

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

October 2026 Critical Patch Update Released | security

web:blogs.oracle.com

For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-11-08 10:21 UTC
September 2026 Critical Security Patch Update Released

web:blogs.oracle.com

For more information about the Critical Security Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-11-08 10:21 UTC
CISA Requires Federal Agencies to Patch Critical Vulnerabilities Within ...

web:cybersecuritynews.com

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued Binding Operational Directive (BOD) 26-04, titled "Prioritizing Security Updates Based on Risk," compelling all Federal Civilian Executive Branch (FCEB) agencies to remediate the most dangerous known exploited vulnerabilities within just three calendar days.

2026-11-08 10:21 UTC
Microsoft Patch Tracker (November 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-11-08 10:21 UTC
SAP Security Patch Day - October 2026

web:support.sap.com

On 13 th of October 2026 , SAP security patch day saw the release of 16 new security notes and 4 GitHub security advisories. There are 2 updates to previously released security notes.

2026-11-08 10:21 UTC
PHP2Shell: The Emergency PHP Patch Is Out - techaeris.com

web:techaeris.com

PHP2Shell, the two critical PHP remote code execution flaws leaked a day early, now has an emergency patch . Here is what shipped, what is still exposed, and what to do.

2026-11-08 10:21 UTC
Addressing PHP2Shell CVE-2026-109618 and CVE-2026-109619: upgrade ...

web:techcommunity.microsoft.com

Learn more: Azure WAF custom rules for PHP2Shell mitigation . Request-side signals alone may not be sufficient to reliably identify certain exploitation attempts. Signals in the server response can provide additional evidence that malicious activity has occurred, enabling more targeted mitigation with higher confidence and lower false positives.

2026-11-08 10:21 UTC
Microsoft October 2026 Patch Tuesday fixes 1,411 flaws, 3 zero-days

web:www.bleepingcomputer.com

Today is Microsoft's October 2026 Patch Tuesday, with security updates addressing a record-breaking 1,411 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.

2026-11-08 10:21 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-11-08 10:21 UTC
Oracle Critical Security Patch Update Advisory - September 2026

web:www.oracle.com

Prior Critical Patch Update and Critical Security Patch Update advisories should be reviewed for information regarding earlier published security patches. Refer to Critical Patch Updates, Critical Security Patch Updates, Security Alerts and Bulletins for information about Oracle Security advisories.

2026-11-08 10:21 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-123961.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:o:totolink:ca300-poe_firmware:*:*:*:*:*:*:*:*"
          ],
          "product": "CA300-PoE",
          "vendor": "TOTOLINK",
          "versions": [
            {
              "status": "affected",
              "version": "6.2c.884"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "wxhwxhwxh_mie (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A security vulnerability has been detected in TOTOLINK CA300-PoE 6.2c.884. This impacts the function setWiFiBasicConfig of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument KeyStr leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 9.4,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "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",
            "version": "3.1"
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      "providerMetadata": {
        "dateUpdated": "2026-11-07T10:15:21.410Z",
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      },
      "references": [
        {
          "name": "VDB-432024 | TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/432024"
        },
        {
          "name": "VDB-432024 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/432024/cti"
        },
        {
          "name": "CVE-2026-123961 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-123961"
        },
        {
          "name": "Submit #1033753 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow",
          "tags": [
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          ],
          "url": "https://vuldb.com/submit/1033753"
        },
        {
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        },
        {
          "tags": [
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          ],
          "url": "https://www.totolink.net/"
        }
      ],
      "timeline": [
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          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-11-06T01:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-11-06T18:12:47.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "TOTOLINK CA300-PoE cstecgi.cgi setWiFiBasicConfig buffer overflow",
      "x_generator": [
        "VulDB PVTS v202611"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-123961",
    "datePublished": "2026-11-07T10:15:21.410Z",
    "dateReserved": "2026-11-06T17:07:26.178Z",
    "dateUpdated": "2026-11-07T10:15:21.410Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}