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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Zbtlink WE1326 unknown
Version Status Constraints
19.1101 affected —
Zbtlink WE2426-C unknown
Version Status Constraints
19.1112 affected —
Zbtlink WE357 unknown
Version Status Constraints
19.1101 affected —
Zbtlink WE5926 unknown
Version Status Constraints
19.1101 affected —
Zbtlink WE5926-EC_QP unknown
Version Status Constraints
20.0516 affected —
Zbtlink WE5926-WD unknown
Version Status Constraints
19.1101 affected —
Zbtlink WE826-Q unknown
Version Status Constraints
19.1101 affected —
Zbtlink WE826-T2 unknown
Version Status Constraints
19.1101 affected —
Zbtlink WE826-WD unknown
Version Status Constraints
19.1101 affected —
Zbtlink WF3526-P unknown
Version Status Constraints
19.051 affected —
Zbtlink WG108 unknown
Version Status Constraints
19.1101 affected —
Zbtlink WG3526 unknown
Version Status Constraints
19.1101 affected —
Unknown CTN720-W1 unknown
Version Status Constraints
19.1101 affected —
Unknown LF-1541 unknown
Version Status Constraints
19.1101 affected —
Unknown MT7620N unknown
Version Status Constraints
19.1101 affected —
Unknown WRC1 unknown
Version Status Constraints
20.0622 affected —

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://vulncheck.com/blog/zbt-darklantern-speakingstone cve-icon cve-icon
https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection cve-icon cve-icon
History

Thu, 27 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Thu, 27 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Zbtlink MQWrt infosrvd Command Injection
Weaknesses CWE-321
CWE-78
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-27T13:41:32.924Z

Reserved: 2026-08-14T18:01:19.917Z

Link: CVE-2026-74233

cve-icon Vulnrichment

Updated: 2026-08-27T13:41:28.947Z

cve-icon NVD

Status : Received

Published: 2026-08-27T13:18:34.137

Modified: 2026-08-27T17:19:52.463

Link: CVE-2026-74233

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-27T14:45:17Z

Weaknesses