Zbtlink MQWrt infosrvd Command Injection
Summary
| CVE | CVE-2026-74233 |
|---|---|
| State | PUBLISHED |
| Assigner | VulnCheck |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-27 13:18:34 UTC |
| Updated | 2026-08-27 17:19:52 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 9.3 CRITICAL from [email protected]
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
Problem Types: CWE-78 | CWE-321 | CWE-321 Use of Hard-coded Cryptographic Key | CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 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/E:X/C... |
| 4.0 | CNA | CVSS | 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 |
| 3.1 | [email protected] | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
NoneUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS: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
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Zbtlink | WE1326 | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WE2426-C | affected 19.1112 custom | Not specified |
| CNA | Zbtlink | WE357 | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WE5926 | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WE5926-EC QP | affected 20.0516 custom | Not specified |
| CNA | Zbtlink | WE5926-WD | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WE826-Q | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WE826-T2 | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WE826-WD | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WF3526-P | affected 19.051 custom | Not specified |
| CNA | Zbtlink | WG108 | affected 19.1101 custom | Not specified |
| CNA | Zbtlink | WG3526 | affected 19.1101 custom | Not specified |
| CNA | Unknown | CTN720-W1 | affected 19.1101 custom | Not specified |
| CNA | Unknown | LF-1541 | affected 19.1101 custom | Not specified |
| CNA | Unknown | MT7620N | affected 19.1101 custom | Not specified |
| CNA | Unknown | WRC1 | affected 20.0622 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection | [email protected] | www.vulncheck.com | |
| vulncheck.com/blog/zbt-darklantern-speakingstone | [email protected] | vulncheck.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Jacob Baines of VulnCheck (en)
There are currently no legacy QID mappings associated with this CVE.