CVE-2025-11846: Zyxel AX7501-b1 Firmware

Medium severity, CVSS 4.9. EPSS: 1.2% chance of exploitation in the next 30 days.

A null pointer dereference vulnerability in the account settings CGI program of the Zyxel VMG3625-T50B firmware versions through 5.50(ABPM.9.6)C0 and the Zyxel WX3100-T0 firmware versions through 5.50(ABVL.4.8)C0 could allow an authenticated attacker with administrator privileges to trigger a denial-of-service (DoS) condition by sending a crafted HTTP request.

Affected products

Zyxel AX7501-b1 Firmware: before 5.17\(abpc.7.1\)c0 (fixed in 5.17\(abpc.7.1\)c0)
Zyxel DX3300-t0 Firmware: before 5.50\(abvy.7.1\)c0 (fixed in 5.50\(abvy.7.1\)c0)
Zyxel DX3300-t1 Firmware: before 5.50\(abvy.7.1\)c0 (fixed in 5.50\(abvy.7.1\)c0)
Zyxel DX3301-t0 Firmware: before 5.50\(abvy.7.1\)c0 (fixed in 5.50\(abvy.7.1\)c0)
Zyxel DX4510-b0 Firmware: before 5.17\(abyl.10.1\)c0 (fixed in 5.17\(abyl.10.1\)c0)
Zyxel DX4510-b1 Firmware: before 5.17\(abyl.10.1\)c0 (fixed in 5.17\(abyl.10.1\)c0)
Zyxel DX5401-b1 Firmware: before 5.17\(abyo.7.1\)c0 (fixed in 5.17\(abyo.7.1\)c0)
Zyxel EE3301-00 Firmware: before 5.63\(acmu.2.1\)c0 (fixed in 5.63\(acmu.2.1\)c0)
Zyxel EE5301-00 Firmware: before 5.63\(acld.2.1\)c0 (fixed in 5.63\(acld.2.1\)c0)
Zyxel EE6510-10 Firmware: before 5.19\(acjq.4.1\)c0 (fixed in 5.19\(acjq.4.1\)c0)
Zyxel EMG3525-t50b Firmware: before 5.50\(abpm.9.7\)c0 (fixed in 5.50\(abpm.9.7\)c0)
Zyxel EMG5523-t50b Firmware: before 5.50\(abpm.9.7\)c0 (fixed in 5.50\(abpm.9.7\)c0)
Zyxel EX2210-t0 Firmware: before 5.50\(acdi.2.3\)c0 (fixed in 5.50\(acdi.2.3\)c0)
Zyxel EX3300-t0 Firmware: before 5.50\(abvy.7.1\)c0 (fixed in 5.50\(abvy.7.1\)c0)
Zyxel EX3300-t1 Firmware: before 5.50\(abvy.7.1\)c0 (fixed in 5.50\(abvy.7.1\)c0)
Zyxel EX3301-t0 Firmware: before 5.50\(abvy.7.1\)c0 (fixed in 5.50\(abvy.7.1\)c0)
Zyxel EX3500-t0 Firmware: before 5.44\(achr.5.1\)c0 (fixed in 5.44\(achr.5.1\)c0)
Zyxel EX3501-t0 Firmware: before 5.44\(achr.5.1\)c0 (fixed in 5.44\(achr.5.1\)c0)
Zyxel EX3510-b0 Firmware: before 5.17\(abup.15.2\)c0 (fixed in 5.17\(abup.15.2\)c0)
Zyxel EX3510-b1 Firmware: before 5.17\(abup.15.2\)c0 (fixed in 5.17\(abup.15.2\)c0)
Zyxel EX3600-t0 Firmware: before 5.70\(acif.2.1\)c0 (fixed in 5.70\(acif.2.1\)c0)
Zyxel EX5401-b1 Firmware: before 5.17\(abyo.7.1\)c0 (fixed in 5.17\(abyo.7.1\)c0)
Zyxel EX5510-b0 Firmware: before 5.17\(abqx.11.1\)c0 (fixed in 5.17\(abqx.11.1\)c0)
Zyxel EX5512-t0 Firmware: before 5.70\(aceg.5.3\)c0 (fixed in 5.70\(aceg.5.3\)c0)
Zyxel EX5601-t0 Firmware: before 5.70\(acdz.5.1\)c0 (fixed in 5.70\(acdz.5.1\)c0)
and 29 more

Published 2026-02-24. Last modified 2026-06-17.