CVE-2026-74232 (GCVE-0-2026-74232)
Vulnerability from cvelistv5 – Published: 2026-08-27 10:39 – Updated: 2026-08-27 14:49Title
Zbtlink MQWrt yunmgrd Cloud C2 Implant
Summary
Zbtlink L3_V2_8 firmware 3.0.0.4.528, Zbtlink WE826-T2 firmware 19.1101, Zbtlink ZBT-7628 firmware 1.0.0.2.007, Zbtlink ZBT-ZBT7621 firmware 1.0.0.3.001, MoreQuick MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, and MQAP-7628 firmware 1.0.0.2.000, AP522 firmware 1.0.0.2.014, AP7628 and HC5661A firmware 3.0.0.4.380, APG721B firmware 19.0809, HK300 firmware 1.0.0.2.032, and MAP-N10 firmware 1.0.0.2.044 ship a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. A remote unauthenticated attacker on the network path can hijack the channel and execute arbitrary commands as root. The attacker can also modify DNS entries, exfiltrate PPPoE credentials, and open reverse SSH tunnels.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 14:48 UTC
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
15 products
| Vendor | Product | Version | |
|---|---|---|---|
| Zbtlink | L3_V2_8 |
Affected:
3.0.0.4.528
(custom)
|
|
| Zbtlink | WE826-T2 |
Affected:
19.1101
(custom)
|
|
| Zbtlink | ZBT-7628 |
Affected:
1.0.0.2.007
(custom)
|
|
| Zbtlink | ZBT-ZBT7621 |
Affected:
1.0.0.3.001
(custom)
|
|
| MoreQuick | MQAC-7620 |
Affected:
1.0.0.2.000
(custom)
|
|
| MoreQuick | MQAC-7620A |
Affected:
1.0.0.2.000
(custom)
|
|
| MoreQuick | MQAP-7620 |
Affected:
1.0.0.2.000
(custom)
|
|
| MoreQuick | MQAP-7620A |
Affected:
1.0.0.2.000
(custom)
|
|
| MoreQuick | MQAP-7628 |
Affected:
1.0.0.2.000
(custom)
|
|
| Unknown | AP522 |
Affected:
1.0.0.2.014
(custom)
|
|
| Unknown | AP7628 |
Affected:
3.0.0.4.380
(custom)
|
|
| Unknown | APG721B |
Affected:
19.0809
(custom)
|
|
| Unknown | HC5661A |
Affected:
3.0.0.4.380
(custom)
|
|
| Unknown | HK300 |
Affected:
1.0.0.2.032
(custom)
|
|
| Unknown | MAP-N10 |
Affected:
1.0.0.2.044
(custom)
|
Date Public
2026-08-27 00:00
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 052e6ddf-44ae-4458-8517-07877f108480
Exploited: Yes
Timestamps
First Seen: 2026-08-27
Asserted: 2026-08-27
Scope
Notes: Affected: Zbtlink / Various | Description: Zbtlink firmware ships with a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. | Exploitation type: unknown | CWEs: CWE-300, CWE-506 | 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-300 CWE-506 |
|---|---|
| Euvd | EUVD-2026-66999 |
| 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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"timestamp": "2026-08-27T14:48:59.362199Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T14:49:06.539Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "L3_V2_8",
"vendor": "Zbtlink",
"versions": [
{
"status": "affected",
"version": "3.0.0.4.528",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "WE826-T2",
"vendor": "Zbtlink",
"versions": [
{
"status": "affected",
"version": "19.1101",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "ZBT-7628",
"vendor": "Zbtlink",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.007",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "ZBT-ZBT7621",
"vendor": "Zbtlink",
"versions": [
{
"status": "affected",
"version": "1.0.0.3.001",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "MQAC-7620",
"vendor": "MoreQuick",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.000",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "MQAC-7620A",
"vendor": "MoreQuick",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.000",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "MQAP-7620",
"vendor": "MoreQuick",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.000",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "MQAP-7620A",
"vendor": "MoreQuick",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.000",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "MQAP-7628",
"vendor": "MoreQuick",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.000",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "AP522",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.014",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "AP7628",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "3.0.0.4.380",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "APG721B",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "19.0809",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "HC5661A",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "3.0.0.4.380",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "HK300",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.032",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "MAP-N10",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "1.0.0.2.044",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jacob Baines of VulnCheck"
}
],
"datePublic": "2026-08-27T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Zbtlink L3_V2_8 firmware 3.0.0.4.528, Zbtlink WE826-T2 firmware 19.1101, Zbtlink ZBT-7628 firmware 1.0.0.2.007, Zbtlink ZBT-ZBT7621 firmware 1.0.0.3.001, MoreQuick MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, and MQAP-7628 firmware 1.0.0.2.000, AP522 firmware 1.0.0.2.014, AP7628 and HC5661A firmware 3.0.0.4.380, APG721B firmware 19.0809, HK300 firmware 1.0.0.2.032, and MAP-N10 firmware 1.0.0.2.044 ship a backdoor command-and-control implant (yunmgrd) reachable over an unauthenticated cleartext UDP channel to a hardcoded C2 server. A remote unauthenticated attacker on the network path can hijack the channel and execute arbitrary commands as root. The attacker can also modify DNS entries, exfiltrate PPPoE credentials, and open reverse SSH tunnels."
}
],
"impacts": [
{
"capecId": "CAPEC-94",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-94 Adversary in the Middle (AiTM)"
}
]
},
{
"capecId": "CAPEC-142",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-142 DNS Cache Poisoning"
}
]
},
{
"capecId": "CAPEC-248",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-248 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-506",
"description": "Embedded Malicious Code",
"lang": "en",
"type": "CWE"
},
{
"cweId": "CWE-300",
"description": "Channel Accessible by Non-Endpoint",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T10:39:14.386Z",
"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-yunmgrd-cloud-c2-implant"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Zbtlink MQWrt yunmgrd Cloud C2 Implant",
"x_generator": {
"engine": "Vulnogram 1.0.4"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-74232",
"datePublished": "2026-08-27T10:39:14.386Z",
"dateReserved": "2026-08-14T18:01:19.917Z",
"dateUpdated": "2026-08-27T14:49:10.575Z",
"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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