CVE-2026-74233

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
http://vulncheck.com/blog/zbt-darklantern-speakingstone
https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-27 13:18

Updated : 2026-08-27 17:19

NVD link : CVE-2026-74233

Mitre link : CVE-2026-74233

CVE.ORG link : CVE-2026-74233

JSON object : View

Products Affected

No product.

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CWE-321

Use of Hard-coded Cryptographic Key

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[{"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"}]}], "published": "2026-08-27T13:18:34.137", "references": [{"url": "http://vulncheck.com/blog/zbt-darklantern-speakingstone", "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection", "source": "disclosure@vulncheck.com"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-321"}]}], "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's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective."}], "lastModified": "2026-08-27T17:19:52.463", "sourceIdentifier": "disclosure@vulncheck.com"}