Vulnerability-Lookup

CVE-2026-74233 (GCVE-0-2026-74233)

Vulnerability from cvelistv5 – Published: 2026-08-27 10:40 – Updated: 2026-08-27 13:41

Title

Zbtlink MQWrt infosrvd Command Injection

Summary

Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.

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 13:41 UTC

CWE

CWE-321 - Use of Hard-coded Cryptographic Key
CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
http://vulncheck.com/blog/zbt-darklantern-speakingstone	technical-descriptionexploit
https://www.vulncheck.com/advisories/zbtlink-mqwr…	third-party-advisory

Impacted products

16 products

Vendor	Product	Version	CPE status
Zbtlink	WE1326	Affected: 19.1101 (custom)	guessed
Zbtlink	WE2426-C	Affected: 19.1112 (custom)	guessed
Zbtlink	WE357	Affected: 19.1101 (custom)	guessed
Zbtlink	WE5926	Affected: 19.1101 (custom)	guessed
Zbtlink	WE5926-EC_QP	Affected: 20.0516 (custom)	guessed
Zbtlink	WE5926-WD	Affected: 19.1101 (custom)	guessed
Zbtlink	WE826-Q	Affected: 19.1101 (custom)	guessed
Zbtlink	WE826-T2	Affected: 19.1101 (custom)	guessed
Zbtlink	WE826-WD	Affected: 19.1101 (custom)	guessed
Zbtlink	WF3526-P	Affected: 19.051 (custom)	guessed
Zbtlink	WG108	Affected: 19.1101 (custom)	guessed
Zbtlink	WG3526	Affected: 19.1101 (custom)	guessed
Unknown	CTN720-W1	Affected: 19.1101 (custom)	guessed
Unknown	LF-1541	Affected: 19.1101 (custom)	guessed
Unknown	MT7620N	Affected: 19.1101 (custom)	guessed
Unknown	WRC1	Affected: 20.0622 (custom)	guessed

Date Public

2026-08-27 00:00

Credits

Jacob Baines of VulnCheck

Show details on NVD website

JSON

To clipboard

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\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Zbtlink\", \"product\": \"WE1326\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE2426-C\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1112\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE357\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE5926\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE5926-EC_QP\", \"versions\": [{\"status\": \"affected\", \"version\": \"20.0516\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE5926-WD\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE826-Q\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE826-T2\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WE826-WD\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WF3526-P\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.051\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WG108\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Zbtlink\", \"product\": \"WG3526\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Unknown\", \"product\": \"CTN720-W1\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Unknown\", \"product\": \"LF-1541\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Unknown\", \"product\": \"MT7620N\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.1101\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Unknown\", \"product\": \"WRC1\", \"versions\": [{\"status\": \"affected\", \"version\": \"20.0622\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2026-08-27T00:00:00.000Z\", \"references\": [{\"url\": \"http://vulncheck.com/blog/zbt-darklantern-speakingstone\", \"name\": \"VulnCheck Blog\", \"tags\": [\"technical-description\", \"exploit\"]}, {\"url\": \"https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection\", \"tags\": [\"third-party-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service\u0027s authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-321\", \"description\": \"Use of Hard-coded Cryptographic Key\"}, {\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-78\", \"description\": \"Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"83251b91-4cc7-4094-a5c7-464a1b83ea10\", \"shortName\": \"VulnCheck\", \"dateUpdated\": \"2026-08-27T10:40:11.313Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74233\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-27T13:41:32.924Z\", \"dateReserved\": \"2026-08-14T18:01:19.917Z\", \"assignerOrgId\": \"83251b91-4cc7-4094-a5c7-464a1b83ea10\", \"datePublished\": \"2026-08-27T10:40:11.313Z\", \"assignerShortName\": \"VulnCheck\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-74233

Vulnerability from fkie_nvd - Published: 2026-08-27 13:18 - Updated: 2026-08-27 17:19

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	http://vulncheck.com/blog/zbt-darklantern-speakingstone
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "WE1326",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE2426-C",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1112",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE357",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE5926",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE5926-EC_QP",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "20.0516",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE5926-WD",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE826-Q",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE826-T2",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WE826-WD",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WF3526-P",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.051",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WG108",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WG3526",
          "vendor": "Zbtlink",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "CTN720-W1",
          "vendor": "Unknown",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "LF-1541",
          "vendor": "Unknown",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "MT7620N",
          "vendor": "Unknown",
          "versions": [
            {
              "status": "affected",
              "version": "19.1101",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "WRC1",
          "vendor": "Unknown",
          "versions": [
            {
              "status": "affected",
              "version": "20.0622",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "disclosure@vulncheck.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service\u0027s authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective."
    }
  ],
  "id": "CVE-2026-74233",
  "lastModified": "2026-08-27T17:19:52.463",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "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/E:X/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-74233",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-27T13:41:26.633961Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-27T13:18:34.137",
  "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-infosrvd-command-injection"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        },
        {
          "lang": "en",
          "value": "CWE-321"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-2H7P-Q23R-5GCF

Vulnerability from github – Published: 2026-08-27 15:31 – Updated: 2026-08-27 15:31

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74233"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-27T13:18:34Z",
    "severity": "CRITICAL"
  },
  "details": "Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service\u0027s authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.",
  "id": "GHSA-2h7p-q23r-5gcf",
  "modified": "2026-08-27T15:31:34Z",
  "published": "2026-08-27T15:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74233"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection"
    },
    {
      "type": "WEB",
      "url": "http://vulncheck.com/blog/zbt-darklantern-speakingstone"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
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.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-74233 (GCVE-0-2026-74233)

FKIE_CVE-2026-74233

GHSA-2H7P-Q23R-5GCF

Tags

Sightings

Nomenclature