CVE-2026-74232 (GCVE-0-2026-74232)

Vulnerability from cvelistv5 – Published: 2026-08-27 10:39 – Updated: 2026-08-27 14:49
VLAI ENISA
Title
Zbtlink MQWrt yunmgrd Cloud C2 Implant
Summary
Zbtlink L3_V2_8 firmware 3.0.0.4.528, Zbtlink WE826-T2 firmware 19.1101, Zbtlink ZBT-7628 firmware 1.0.0.2.007, Zbtlink ZBT-ZBT7621 firmware 1.0.0.3.001, MoreQuick MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, and MQAP-7628 firmware 1.0.0.2.000, AP522 firmware 1.0.0.2.014, AP7628 and HC5661A firmware 3.0.0.4.380, APG721B firmware 19.0809, HK300 firmware 1.0.0.2.032, and MAP-N10 firmware 1.0.0.2.044 ship a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. A remote unauthenticated attacker on the network path can hijack the channel and execute arbitrary commands as root. The attacker can also modify DNS entries, exfiltrate PPPoE credentials, and open reverse SSH tunnels.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 14:48 UTC
CWE
  • CWE-506 - Embedded Malicious Code
  • CWE-300 - Channel Accessible by Non-Endpoint
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7784 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Zbtlink L3_V2_8 Affected: 3.0.0.4.528 (custom)
guessed Create a notification for this product.
Zbtlink WE826-T2 Affected: 19.1101 (custom)
guessed Create a notification for this product.
Zbtlink ZBT-7628 Affected: 1.0.0.2.007 (custom)
guessed Create a notification for this product.
Zbtlink ZBT-ZBT7621 Affected: 1.0.0.3.001 (custom)
guessed Create a notification for this product.
MoreQuick MQAC-7620 Affected: 1.0.0.2.000 (custom)
guessed Create a notification for this product.
MoreQuick MQAC-7620A Affected: 1.0.0.2.000 (custom)
guessed Create a notification for this product.
MoreQuick MQAP-7620 Affected: 1.0.0.2.000 (custom)
guessed Create a notification for this product.
MoreQuick MQAP-7620A Affected: 1.0.0.2.000 (custom)
guessed Create a notification for this product.
MoreQuick MQAP-7628 Affected: 1.0.0.2.000 (custom)
guessed Create a notification for this product.
Unknown AP522 Affected: 1.0.0.2.014 (custom)
guessed Create a notification for this product.
Unknown AP7628 Affected: 3.0.0.4.380 (custom)
guessed Create a notification for this product.
Unknown APG721B Affected: 19.0809 (custom)
guessed Create a notification for this product.
Unknown HC5661A Affected: 3.0.0.4.380 (custom)
guessed Create a notification for this product.
Unknown HK300 Affected: 1.0.0.2.032 (custom)
guessed Create a notification for this product.
Unknown MAP-N10 Affected: 1.0.0.2.044 (custom)
guessed Create a notification for this product.
Date Public
2026-08-27 00:00
Credits
Jacob Baines of VulnCheck
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6e0dfb39-c25e-49cc-8dfa-c6badf3d0e4c

Vulnerability ID: CVE-2026-74232

Status: Confirmed

Status Updated: 2026-08-27 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: Affected: Zbtlink / Various | Description: Zbtlink firmware ships with a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. | Exploitation type: unknown | CWEs: CWE-300, CWE-506 | Origin source: ENISA | Notes: https://www.vulncheck.com/blog/zbt-darklantern-speakingstone
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes CWE-300 CWE-506
Euvd EUVD-2026-66999
Notes https://www.vulncheck.com/blog/zbt-darklantern-speakingstone
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product Various
Datereported 2026/08/27
Originsource ENISA
Patchedsince
Vendorproject Zbtlink
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-11-04 13:00 UTC | Updated: 2026-11-04 13:00 UTC
Show details on NVD website
To clipboard 

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                "version": "4.0",
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                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "disclosure@vulncheck.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-74232",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-27T14:48:59.362199Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-27T13:18:33.917",
        "references": [
          {
            "source": "disclosure@vulncheck.com",
            "url": "http://vulncheck.com/blog/zbt-darklantern-speakingstone"
          },
          {
            "source": "disclosure@vulncheck.com",
            "url": "https://www.vulncheck.com/advisories/zbtlink-mqwrt-yunmgrd-cloud-c2-implant"
          }
        ],
        "sourceIdentifier": "disclosure@vulncheck.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-300"
              },
              {
                "lang": "en",
                "value": "CWE-506"
              }
            ],
            "source": "disclosure@vulncheck.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-74232",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-27T14:48:59.362199Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-27T14:49:06.539Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unknown",
              "product": "L3_V2_8",
              "vendor": "Zbtlink",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.0.0.4.528",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "WE826-T2",
              "vendor": "Zbtlink",
              "versions": [
                {
                  "status": "affected",
                  "version": "19.1101",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "ZBT-7628",
              "vendor": "Zbtlink",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.007",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "ZBT-ZBT7621",
              "vendor": "Zbtlink",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.3.001",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "MQAC-7620",
              "vendor": "MoreQuick",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.000",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "MQAC-7620A",
              "vendor": "MoreQuick",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.000",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "MQAP-7620",
              "vendor": "MoreQuick",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.000",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "MQAP-7620A",
              "vendor": "MoreQuick",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.000",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "MQAP-7628",
              "vendor": "MoreQuick",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.000",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "AP522",
              "vendor": "Unknown",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.014",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "AP7628",
              "vendor": "Unknown",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.0.0.4.380",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "APG721B",
              "vendor": "Unknown",
              "versions": [
                {
                  "status": "affected",
                  "version": "19.0809",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "HC5661A",
              "vendor": "Unknown",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.0.0.4.380",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "HK300",
              "vendor": "Unknown",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.032",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unknown",
              "product": "MAP-N10",
              "vendor": "Unknown",
              "versions": [
                {
                  "status": "affected",
                  "version": "1.0.0.2.044",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Jacob Baines of VulnCheck"
            }
          ],
          "datePublic": "2026-08-27T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "Zbtlink L3_V2_8 firmware 3.0.0.4.528, Zbtlink WE826-T2 firmware 19.1101, Zbtlink ZBT-7628 firmware 1.0.0.2.007, Zbtlink ZBT-ZBT7621 firmware 1.0.0.3.001, MoreQuick MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, and MQAP-7628 firmware 1.0.0.2.000, AP522 firmware 1.0.0.2.014, AP7628 and HC5661A firmware 3.0.0.4.380, APG721B firmware 19.0809, HK300 firmware 1.0.0.2.032, and MAP-N10 firmware 1.0.0.2.044 ship a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. A remote unauthenticated attacker on the network path can hijack the channel and execute arbitrary commands as root. The attacker can also modify DNS entries, exfiltrate PPPoE credentials, and open reverse SSH tunnels."
            }
          ],
          "impacts": [
            {
              "capecId": "CAPEC-94",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-94 Adversary in the Middle (AiTM)"
                }
              ]
            },
            {
              "capecId": "CAPEC-142",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-142 DNS Cache Poisoning"
                }
              ]
            },
            {
              "capecId": "CAPEC-248",
              "descriptions": [
                {
                  "lang": "en",
                  "value": "CAPEC-248 Command Injection"
                }
              ]
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            },
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-506",
                  "description": "Embedded Malicious Code",
                  "lang": "en",
                  "type": "CWE"
                },
                {
                  "cweId": "CWE-300",
                  "description": "Channel Accessible by Non-Endpoint",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-27T10:39:14.386Z",
            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
          },
          "references": [
            {
              "name": "VulnCheck Blog",
              "tags": [
                "technical-description",
                "exploit"
              ],
              "url": "http://vulncheck.com/blog/zbt-darklantern-speakingstone"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/zbtlink-mqwrt-yunmgrd-cloud-c2-implant"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Zbtlink MQWrt yunmgrd Cloud C2 Implant",
          "x_generator": {
            "engine": "Vulnogram 1.0.4"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-74232",
        "datePublished": "2026-08-27T10:39:14.386Z",
        "dateReserved": "2026-08-14T18:01:19.917Z",
        "dateUpdated": "2026-08-27T14:49:10.575Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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