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Actively exploited No authentication
CVE-2026-74232

Unknown ZBT-ZBT7621

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…

CheckOps priority index
4.9/10 Patch within 7 days
Severity9.3
Probability0.1
Exploitation2/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 0.81% higher than 57.0% of CVEs
CVSS 4.0 9.3 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/
Exploited for 68 days 27 Aug 2026
Fixed packages 0 / 0 in open source registries

Exploitation probability EPSS · FIRST

05010025 Sep05 Oct15 Oct24 Oct02 Nov
EPSS probability (%)Percentile among all CVEs

Exploitation signals 2 / 5

  • KEV catalog (CISA)no
  • Exploited in EUVD (ENISA)27 Aug 2026
  • Used by ransomwareno
  • EPSS above 10 %0.81%
  • No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

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.

Affected products

ZBT-ZBT7621MAP-N10MQAP-7620MQAP-7628MQAC-7620AWE826-T2ZBT-7628MQAC-7620AP522MQAP-7620AAPG721BAP7628HC5661AHK300L3_V2_8
Affected versions
  • 1.0.0.3.001
  • 1.0.0.2.044
  • 1.0.0.2.000
  • 19.1101
  • 1.0.0.2.007
  • 1.0.0.2.014
  • 19.0809
  • 3.0.0.4.380
  • 1.0.0.2.032
  • 3.0.0.4.528

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

  1. Published

  2. Exploitation reported (ENISA)

References

Other exploited vulnerabilities from the same vendor

Are you affected?

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Get notified at launch

Sources: CISA KEV · ENISA EUVD · FIRST EPSS · OSV. Public data aggregated by CheckOps, updated automatically. Source texts remain the property of their authors. All exploited vulnerabilities