CVE-2026-123957

Description

A vulnerability was determined in TOTOLINK CA300-PoE 6.2c.884. Impacted is the function setIpQosRules of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument ipStart causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.

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 08:15 UTC
Last updated: 2026-11-07 08:15 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/123xxx/CVE-2026-123957.json
Linked Threat: CVE-2026-123957 — TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-11-07 09:17:14 UTC
NVD last modified: 2026-11-07 09:17:15 UTC
NVD CVSS v3.1: 9.9 / 10 CRITICAL source: cna@vuldb.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Exploitability subscore: 3.1 / 10
Impact subscore: 6.0 / 10
EPSS score: 0.0047 (probability of exploitation in next 30 days)
EPSS percentile: 40.62% vs all CVEs — higher = more likely to be exploited, as of 2026-11-08

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-2026-118996
Assigner: VulDB
Published: Nov 7, 2026, 8:15:13 AM
Updated: Nov 7, 2026, 8:15:13 AM
EUVD base score (CVSS 4.0): 9.4 / 10
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
EUVD-reported EPSS: 0.4700
Vendors: Totolink
Products: CA300-PoE (6.2c.884)
Aliases: GHSA-wxh7-x4wq-j3rp

ENISA description: A vulnerability was determined in TOTOLINK CA300-PoE 6.2c.884. Impacted is the function setIpQosRules of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument ipStart causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized.

EUVD references (6)

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-432020 | TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow vdb-entrytechnical-description
VDB-432020 | CTI Indicators (IOB, IOC, IOA) signaturepermissions-required
CVE-2026-123957 | CVE Analysis and Report third-party-advisory
Submit #1033672 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow third-party-advisory
https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setIpQosRules-3f953a41781f801195e5e07dfe7488b9?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-setIpQosRules-3f953a41781f801195e5e07dfe7488b9?source=copy_link exploit
CVE-2026-123957 | CVE Analysis and Report third-party-advisory
Submit #1033672 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow third-party-advisory
VDB-432020 | TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow vdb-entry, technical-description
VDB-432020 | 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.

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setIpQosRules-3f953a41781f801195e5e07dfe7488b9?source=copy_link cna@vuldb.com
https://vuldb.com/cve/CVE-2026-123957 cna@vuldb.com
https://vuldb.com/submit/1033672 cna@vuldb.com
https://vuldb.com/vuln/432020 cna@vuldb.com
https://vuldb.com/vuln/432020/cti cna@vuldb.com
https://www.totolink.net/ cna@vuldb.com

Remediations (10)

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

CVE-2026-123957: TOTOLINK CA300-PoE, CVSS 9.9 | CVE Brief

web:cvebrief.com

Remediation Immediate Action: Contact the vendor for an official patch or firmware update, as no specific fixed version is currently documented. If no update is available, restrict access to the device management interface to trusted internal segments only.

2026-11-08 10:21 UTC
CVE Database Search & Remediation Guidance

web:cvedatabase.com

Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.

2026-11-08 10:21 UTC
CVE-2026-123957: Totolink CA300 PoE Buffer Overflow - CVETodo

web:cvetodo.com

CVE-2026-123957 is a CVSS 9.9 Buffer Overflow vulnerability in Totolink CA300 PoE. See exploitation status, patch guidance, and technical details.

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
CVE Vulnerabilities 2026: Critical Flaws & Fixes Hub

web:cyberupdates365.com

Track critical CVE vulnerabilities 2026 with verified enterprise patch guides. Fix zero-days across VMware, WordPress, Windows, and cloud infrastructure.

2026-11-08 10:21 UTC
CVE 2026 | The Complete Guide to New, Critical & Actively Exploited ...

web:malware.news

Google specifically recommends sandboxing agentic workloads and moving to risk-based triage. How to Fix and Prioritize CVE 2026 Vulnerabilities Fix CVE-2026 vulnerabilities by patching exploited and internet-exposed systems first, applying vendor mitigations where a patch lags, and ranking everything else using CVSS, EPSS, and KEV together.

2026-11-08 10:21 UTC
What Is CVE Remediation in 2026? - aikido.dev

web:www.aikido.dev

CVE remediation is fixing known flaws in the software you run. Why upgrading often fails, what remediation actually involves, and how backporting fixes it.

2026-11-08 10:21 UTC
Patch now: PHP2Shell, Brotli, and eMudhra guidance for customers

web:www.microsoft.com

If you can't patch immediately: Apply the PHP project's interim mitigations and the Azure WAF protections. Note: This reduces exposure but doesn't fix the underlying vulnerabilities.

2026-11-08 10:21 UTC
The 8 Best Automated Vulnerability Remediation Tools in 2026

web:www.openhands.dev

Compare 8 automated vulnerability remediation tools for 2026 on fixes, prioritization, integrations, and deployment control.

2026-11-08 10:21 UTC
CVE-2026-123957: Buffer Overflow - Analysis & Fix | TheHackerWire

web:www.thehackerwire.com

How do I fix or mitigate CVE-2026-123957 ? To protect against CVE-2026-123957 , you should: (1) Apply the latest security patches from the vendor, (2) Check official security advisories for specific remediation steps, (3) Update affected software to the latest version, and (4) Monitor your systems for any signs of exploitation.

2026-11-08 10:21 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-123957.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 vulnerability was determined in TOTOLINK CA300-PoE 6.2c.884. Impacted is the function setIpQosRules of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument ipStart causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized."
        }
      ],
      "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": {
            "baseScore": 9.9,
            "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"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:C",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 9,
            "vectorString": "AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:C",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-120",
              "description": "Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-119",
              "description": "Memory Corruption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-07T08:15:13.072Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-432020 | TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/432020"
        },
        {
          "name": "VDB-432020 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/432020/cti"
        },
        {
          "name": "CVE-2026-123957 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-123957"
        },
        {
          "name": "Submit #1033672 | TOTOLINK CA300-PoE CA300-PoE_Firmware V6.2c.884 Buffer Overflow",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/1033672"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://lavender-bicycle-a5a.notion.site/TOTOLINK-CA300-PoE-setIpQosRules-3f953a41781f801195e5e07dfe7488b9?source=copy_link"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://www.totolink.net/"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-11-06T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-11-06T01:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-11-06T18:12:32.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "TOTOLINK CA300-PoE cstecgi.cgi setIpQosRules buffer overflow",
      "x_generator": [
        "VulDB PVTS v202611"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-123957",
    "datePublished": "2026-11-07T08:15:13.072Z",
    "dateReserved": "2026-11-06T17:07:11.931Z",
    "dateUpdated": "2026-11-07T08:15:13.072Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}