CVE-2026-74233 (GCVE-0-2026-74233)
Vulnerability from cvelistv5 – Published: 2026-08-27 10:40 – Updated: 2026-08-27 13:41Title
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
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 13:41 UTC
CWE
Assigner
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 | |
|---|---|---|---|
| Zbtlink | WE1326 |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WE2426-C |
Affected:
19.1112
(custom)
|
|
| Zbtlink | WE357 |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WE5926 |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WE5926-EC_QP |
Affected:
20.0516
(custom)
|
|
| Zbtlink | WE5926-WD |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WE826-Q |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WE826-T2 |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WE826-WD |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WF3526-P |
Affected:
19.051
(custom)
|
|
| Zbtlink | WG108 |
Affected:
19.1101
(custom)
|
|
| Zbtlink | WG3526 |
Affected:
19.1101
(custom)
|
|
| Unknown | CTN720-W1 |
Affected:
19.1101
(custom)
|
|
| Unknown | LF-1541 |
Affected:
19.1101
(custom)
|
|
| Unknown | MT7620N |
Affected:
19.1101
(custom)
|
|
| Unknown | WRC1 |
Affected:
20.0622
(custom)
|
Date Public
2026-08-27 00:00
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d438936a-c9b7-4d16-a2e6-fbf79cca8650
Exploited: Yes
Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: Affected: Zbtlink / Various | Description: Zbtlink firmware contain an unauthenticated command injection in the infosrvd service (UDP/9992). | Exploitation type: unknown | CWEs: CWE-78, CWE-321 | 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-78 CWE-321 |
|---|---|
| Euvd | EUVD-2026-67000 |
| 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: 2026-10-02 08:52 CEST
| Updated: 2026-10-02 08:52 CEST
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"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"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jacob Baines of VulnCheck"
}
],
"datePublic": "2026-08-27T00:00:00.000Z",
"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."
}
],
"impacts": [
{
"capecId": "CAPEC-88",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-88 OS 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-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)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T10:40:11.313Z",
"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-infosrvd-command-injection"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Zbtlink MQWrt infosrvd Command Injection",
"x_generator": {
"engine": "Vulnogram 1.0.4"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-74233",
"datePublished": "2026-08-27T10:40:11.313Z",
"dateReserved": "2026-08-14T18:01:19.917Z",
"dateUpdated": "2026-08-27T13:41:32.924Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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