Zbtlink/MoreQuick MAP-N10 up to 19.1101 backdoor

Summaryinfo

A vulnerability was found in Zbtlink/MoreQuick L3_V2_8, WE826-T2, ZBT-7628, ZBT-ZBT7621, MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, MQAP-7628, AP522, AP7628, APG721B, HC5661A, HK300 and MAP-N10. It has been classified as very critical. The affected element is an unknown function. The manipulation leads to backdoor. This vulnerability is traded as CVE-2026-74232. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Zbtlink/MoreQuick L3_V2_8, WE826-T2, ZBT-7628, ZBT-ZBT7621, MQAC-7620, MQAC-7620A, MQAP-7620, MQAP-7620A, MQAP-7628, AP522, AP7628, APG721B, HC5661A, HK300 and MAP-N10 and classified as very critical. This issue affects an unknown code block. The manipulation with an unknown input leads to a backdoor vulnerability. Using CWE to declare the problem leads to CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at vulncheck.com. The identification of this vulnerability is CVE-2026-74232 since 08/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2026). MITRE ATT&CK project uses the attack technique T1588.001 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• MoreQuick
• Zbtlink

Name

• AP522
• AP7628
• APG721B
• HC5661A
• HK300
• L3_V2_8
• MAP-N10
• MQAC-7620
• MQAC-7620A
• MQAP-7620
• MQAP-7620A
• MQAP-7628
• WE826-T2
• ZBT-7628
• ZBT-ZBT7621

Version

• 1.0.0.2.000
• 1.0.0.2.007
• 1.0.0.2.014
• 1.0.0.2.032
• 1.0.0.2.044
• 1.0.0.3.001
• 3.0.0.4.380
• 3.0.0.4.528
• 19.0809
• 19.1101

CPE 2.3info

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CPE 2.2info

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CVSSv4info

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Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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