CVE-2024-38266

Severity: medium (CVSS 4.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-24 · updated 2026-06-17
Weakness: CWE-119

Description

An improper restriction of operations within the bounds of a memory buffer in the parameter type parser of the Zyxel VMG8825-T50K firmware versions through 5.50(ABOM.8)C0 could allow an authenticated attacker with administrator privileges to cause potential memory corruptions, resulting in a thread crash on an affected device.

Affected products

Zyxel AX7501-B0 firmware: before 5.17\(abpc.5\)c0 — fixed in 5.17\(abpc.5\)c0
Zyxel AX7501-B1 firmware: before 5.17\(abpc.5\)c0 — fixed in 5.17\(abpc.5\)c0
Zyxel DX3300-T0 firmware: before 5.50\(abvy.5\)c0 — fixed in 5.50\(abvy.5\)c0
Zyxel DX3300-T1 firmware: before 5.50\(abvy.5\)c0 — fixed in 5.50\(abvy.5\)c0
Zyxel DX3301-T0 firmware: before 5.50\(abvy.5\)c0 — fixed in 5.50\(abvy.5\)c0
Zyxel Dx4510-B0 Firmware: before 5.17\(abyl.6\)c0 — fixed in 5.17\(abyl.6\)c0
Zyxel Dx4510-B1 Firmware: before 5.17\(abyl.6\)c0 — fixed in 5.17\(abyl.6\)c0
Zyxel DX5401-B0 firmware: before 5.17\(abyo.6\)c0 — fixed in 5.17\(abyo.6\)c0
Zyxel Dx5401-B1 Firmware: before 5.17\(abyo.6\)c0 — fixed in 5.17\(abyo.6\)c0
Zyxel Emg3525-T50B Firmware: before 5.50\(abpm.9\)c0 — fixed in 5.50\(abpm.9\)c0
Zyxel Emg5523-T50B Firmware: before 5.50\(abpm.9\)c0 — fixed in 5.50\(abpm.9\)c0
Zyxel Emg5723-T50K Firmware: before 5.50\(abom.8\)c0 — fixed in 5.50\(abom.8\)c0
Zyxel Ex3300-T0 Firmware: before 5.50\(abvy.5\)c0 — fixed in 5.50\(abvy.5\)c0
Zyxel Ex3300-T1 Firmware: before 5.50\(abvy.5\)c0 — fixed in 5.50\(abvy.5\)c0
Zyxel EX3301-T0 firmware: before 5.50\(abvy.5\)c0 — fixed in 5.50\(abvy.5\)c0
Zyxel Ex3500-T0 Firmware: before 5.44\(achr.1\)c0 — fixed in 5.44\(achr.1\)c0
Zyxel EX3501-T0 firmware: before 5.44\(achr.1\)c0 — fixed in 5.44\(achr.1\)c0
Zyxel EX3510-B0 firmware: before 5.17\(abup.11\)c0 — fixed in 5.17\(abup.11\)c0
Zyxel Ex3510-B1 Firmware: before 5.17\(abup.11\)c0 — fixed in 5.17\(abup.11\)c0
Zyxel Ex3600-T0 Firmware: before 5.70\(acif.0.2\)c0 — fixed in 5.70\(acif.0.2\)c0
Zyxel Ex5401-B0 Firmware: before 5.17\(abyo.6\)c0 — fixed in 5.17\(abyo.6\)c0
Zyxel Ex5401-B1 Firmware: before 5.17\(abyo.6\)c0 — fixed in 5.17\(abyo.6\)c0
Zyxel Ex5510-B0 Firmware: before 5.17\(abqx.9\)c0 — fixed in 5.17\(abqx.9\)c0
Zyxel Ex5512-T0 Firmware: before 5.70\(aceg.3\)c1 — fixed in 5.70\(aceg.3\)c1
Zyxel Ex5601-T0 Firmware: before 5.70\(acdz.3\)c0 — fixed in 5.70\(acdz.3\)c0
Zyxel EX5601-T1 firmware: before 5.70\(acdz.3\)c0 — fixed in 5.70\(acdz.3\)c0
Zyxel Ex7501-B0 Firmware: before 5.18\(achn.1\)c0 — fixed in 5.18\(achn.1\)c0
Zyxel Ex7710-B0 Firmware: before 5.18\(acak.1\)c0 — fixed in 5.18\(acak.1\)c0
Zyxel Pm3100-T0 Firmware: before 5.42\(acbf.2\)c0 — fixed in 5.42\(acbf.2\)c0
Zyxel Pm5100-T0 Firmware: before 5.42\(acbf.2\)c0 — fixed in 5.42\(acbf.2\)c0

How to fix

Upgrade to a fixed version: Zyxel AX7501-B0 firmware 5.17\(abpc.5\)c0; Zyxel AX7501-B1 firmware 5.17\(abpc.5\)c0; Zyxel DX3300-T0 firmware 5.50\(abvy.5\)c0; Zyxel DX3300-T1 firmware 5.50\(abvy.5\)c0; Zyxel DX3301-T0 firmware 5.50\(abvy.5\)c0; Zyxel Dx4510-B0 Firmware 5.17\(abyl.6\)c0; Zyxel Dx4510-B1 Firmware 5.17\(abyl.6\)c0; Zyxel DX5401-B0 firmware 5.17\(abyo.6\)c0; Zyxel Dx5401-B1 Firmware 5.17\(abyo.6\)c0; Zyxel Emg3525-T50B Firmware 5.50\(abpm.9\)c0; Zyxel Emg5523-T50B Firmware 5.50\(abpm.9\)c0; Zyxel Emg5723-T50K Firmware 5.50\(abom.8\)c0. Check the vendor advisory for mitigations.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-memory-corruption-vulnerabilities-in-some-dsl-ethernet-cpe-fiber-ont-wifi-extender-and-security-router-versions-09-24-2024

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