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3 vulnerabilities found for by Zbtlink
CVE-2026-74233 (GCVE-0-2026-74233)
Vulnerability from cvelistv5
Published
2026-08-27 10:40
Modified
2026-08-27 13:41
Severity ?
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
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VLAI Severity ?
EPSS score ?
CWE
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.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
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Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zbtlink | WE1326 |
Version: 19.1101 < |
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{
"defaultStatus": "unknown",
"product": "WF3526-P",
"vendor": "Zbtlink",
"versions": [
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}
]
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"product": "WG108",
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"vendor": "Zbtlink",
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"version": "20.0622",
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CVE-2026-74232 (GCVE-0-2026-74232)
Vulnerability from cvelistv5
Published
2026-08-27 10:39
Modified
2026-08-27 14:49
Severity ?
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
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VLAI Severity ?
EPSS score ?
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.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zbtlink | L3_V2_8 |
Version: 3.0.0.4.528 < |
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|
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],
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"timestamp": "2026-08-27T14:48:59.362199Z",
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},
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"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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"defaultStatus": "unknown",
"product": "L3_V2_8",
"vendor": "Zbtlink",
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"defaultStatus": "unknown",
"product": "WE826-T2",
"vendor": "Zbtlink",
"versions": [
{
"status": "affected",
"version": "19.1101",
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]
},
{
"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"
}
]
},
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"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": [
{
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},
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"vendor": "MoreQuick",
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{
"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"
}
]
},
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"defaultStatus": "unknown",
"product": "AP7628",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "3.0.0.4.380",
"versionType": "custom"
}
]
},
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"defaultStatus": "unknown",
"product": "APG721B",
"vendor": "Unknown",
"versions": [
{
"status": "affected",
"version": "19.0809",
"versionType": "custom"
}
]
},
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"defaultStatus": "unknown",
"product": "HC5661A",
"vendor": "Unknown",
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{
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"version": "3.0.0.4.380",
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}
]
},
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"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": [
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"lang": "en",
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}
],
"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": [
{
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"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
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"attackVector": "NETWORK",
"baseScore": 9.3,
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"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",
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"vulnIntegrityImpact": "HIGH",
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"userInteraction": "NONE",
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"version": "3.1"
},
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{
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}
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}
],
"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": {
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},
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"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": {
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}
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},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"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",
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}
CVE-2026-66747 (GCVE-0-2026-66747)
Vulnerability from cvelistv5
Published
2026-08-05 10:50
Modified
2026-08-05 14:20
Severity ?
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
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VLAI Severity ?
EPSS score ?
CWE
- CWE-506 - Embedded Malicious Code
Summary
Zbtlink router firmware ships an embedded remote-control implant, ENDLESSDOORS, present in every published build across the product line. It is the open-source ycsunjane/rctl tool built in as an OpenWrt package (librctl.so), started at boot and run as root under the process name kworker to blend in with the kernel's [kworker/*] threads. It opens no listening port; it phones home over cleartext TCP to a hardcoded command-and-control server (command channel 7000, interactive-shell callback 7001) with no authentication and no transport encryption, re-attempting contact roughly every 35 seconds. Its command handler passes any received string to popen() as uid=0, and a reserved rctlbash command returns an interactive root shell. Because the channel is unauthenticated and cleartext, control is not limited to whoever planted it: any party that answers at the C2 address, occupies the network path (DNS or route hijack), or acquires the hardcoded fallback domain obtains unauthenticated remote code execution as root.
References
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Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Zbtlink | CPE2801 Firmware |
Version: 22.10.09 < cpe:2.3:o:zbtlink:cpe2801_firmware:*:*:*:*:*:*:*:* |
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