Assessment
Why it matters
EPSS is 1.2%; technical severity is CVSS 7.2.
A post-authentication command injection vulnerability in the “DomainName” parameter of the DHCP configuration file in Zyxel DX3301-T0 and EX3301-T0 firmware versions through 5.50(ABVY.7.1)C0 could allow an authenticated attacker with administrator privileges to execute OS commands on an affected device.
Who should care
- Teams operating Am7510-00 Firmware, Ax7501-b1 Firmware, Dx3300-t0 Firmware +42 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Am7510-00 Firmware, Ax7501-b1 Firmware, Dx3300-t0 Firmware +42 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Vendor advisory from www.zyxel.com
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-78
- Affected versions
- Zyxel Am7510-00 Firmware (End Excluding 5.63\(acor.0.2\)c0); Zyxel Ax7501-b1 Firmware (End Excluding 5.17\(abpc.7.2\)c0); Zyxel Dx3300-t0 Firmware (End Excluding 5.50\(abvy.7.2\)c0); Zyxel Dx3300-t1 Firmware (End Excluding 5.50\(abvy.7.2\)c0); Zyxel Dx3301-t0 Firmware (End Excluding 5.50\(abvy.7.2\)c0); Zyxel Dx5401-b1 Firmware (End Excluding 5.17\(abyo.7.2\)c0); Zyxel Ee3301-00 Firmware (End Excluding 5.63\(acmu.3.1\)c0); Zyxel Ee5301-00 Firmware (End Excluding 5.63\(acld.3.1\)c0)
- Fixed versions
- Zyxel Am7510-00 Firmware (Fixed from 5.63\(acor.0.2\)c0); Zyxel Ax7501-b1 Firmware (Fixed from 5.17\(abpc.7.2\)c0); Zyxel Dx3300-t0 Firmware (Fixed from 5.50\(abvy.7.2\)c0); Zyxel Dx3300-t1 Firmware (Fixed from 5.50\(abvy.7.2\)c0); Zyxel Dx3301-t0 Firmware (Fixed from 5.50\(abvy.7.2\)c0); Zyxel Dx5401-b1 Firmware (Fixed from 5.17\(abyo.7.2\)c0); Zyxel Ee3301-00 Firmware (Fixed from 5.63\(acmu.3.1\)c0); Zyxel Ee5301-00 Firmware (Fixed from 5.63\(acld.3.1\)c0)
- Published
- 28 April 2026
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
Signal timeline
- CVE published
- Latest EPSS score: 1.2%
- Signal calculated at 12