CVE-2024-8748

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-03 · updated 2026-06-17
Weakness: CWE-120

Description

A buffer overflow vulnerability in the packet parser of the third-party library "libclinkc" in Zyxel VMG8825-T50K firmware versions through V5.50(ABOM.8.4)C0 could allow an attacker to cause a temporary denial of service (DoS) condition against the web management interface by sending a crafted HTTP POST request to a vulnerable device.

Affected products

Zyxel AX7501-B0 firmware: before 5.17\(abpc.5.3\)c0 — fixed in 5.17\(abpc.5.3\)c0
Zyxel AX7501-B1 firmware: before 5.17\(abpc.5.3\)c0 — fixed in 5.17\(abpc.5.3\)c0
Zyxel DX3300-T0 firmware: before 5.50\(aby.5.4\)c0 — fixed in 5.50\(aby.5.4\)c0
Zyxel DX3300-T1 firmware: before 5.50\(aby.5.4\)c0 — fixed in 5.50\(aby.5.4\)c0
Zyxel DX3301-T0 firmware: before 5.50\(aby.5.4\)c0 — fixed in 5.50\(aby.5.4\)c0
Zyxel Dx4510-B0 Firmware: before 5.17\(abyl.8\)c0 — fixed in 5.17\(abyl.8\)c0
Zyxel Dx4510-B1 Firmware: before 5.17\(abyl.8\)c0 — fixed in 5.17\(abyl.8\)c0
Zyxel DX5401-B0 firmware: before 5.17\(abyo.6.4\)c0 — fixed in 5.17\(abyo.6.4\)c0
Zyxel Dx5401-B1 Firmware: before 5.17\(abyo.6.4\)c0 — fixed in 5.17\(abyo.6.4\)c0
Zyxel Ee6510-10 Firmware: before 5.19\(acjq.1\)c0 — fixed in 5.19\(acjq.1\)c0
Zyxel Emg3525-T50B Firmware: before 5.50\(abpm.9.3\)c0 — fixed in 5.50\(abpm.9.3\)c0
Zyxel Emg5523-T50B Firmware: before 5.50\(abpm.9.3\)c0 — fixed in 5.50\(abpm.9.3\)c0
Zyxel Emg5723-T50K Firmware: before 5.50\(abom.8.5\)c0 — fixed in 5.50\(abom.8.5\)c0
Zyxel Emg6726-B10A Firmware: before 5.13\(abnp.8\)c1 — fixed in 5.13\(abnp.8\)c1
Zyxel Ex2210-T0 Firmware: before 5.50\(acdi.2\)c0 — fixed in 5.50\(acdi.2\)c0
Zyxel Ex3300-T0 Firmware: before 5.50\(aby.5.4\)c0 — fixed in 5.50\(aby.5.4\)c0
Zyxel Ex3300-T1 Firmware: before 5.50\(aby.5.4\)c0 — fixed in 5.50\(aby.5.4\)c0
Zyxel EX3301-T0 firmware: before 5.50\(aby.5.4\)c0 — fixed in 5.50\(aby.5.4\)c0
Zyxel Ex3500-T0 Firmware: before 5.44\(achr.3\)c0 — fixed in 5.44\(achr.3\)c0
Zyxel EX3501-T0 firmware: before 5.44\(achr.3\)c0 — fixed in 5.44\(achr.3\)c0
Zyxel EX3510-B0 firmware: before 5.17\(abup.13\)c0 — fixed in 5.17\(abup.13\)c0
Zyxel Ex3510-B1 Firmware: before 5.17\(abup.13\)c0 — fixed in 5.17\(abup.13\)c0
Zyxel Ex3600-T0 Firmware: before 5.70\(acif.0.4\)c0 — fixed in 5.70\(acif.0.4\)c0
Zyxel Ex5401-B0 Firmware: before 5.17\(abyo.6.4\)c0 — fixed in 5.17\(abyo.6.4\)c0
Zyxel Ex5401-B1 Firmware: before 5.17\(abyo.6.4\)c0 — fixed in 5.17\(abyo.6.4\)c0
Zyxel Ex5501-B0 Firmware: before 5.17\(abry.5.3\)c0 — fixed in 5.17\(abry.5.3\)c0
Zyxel Ex5510-B0 Firmware: before 5.17\(abqx.11\)c0 — fixed in 5.17\(abqx.11\)c0
Zyxel Ex5512-T0 Firmware: before 5.70\(aceg4.2\)c0 — fixed in 5.70\(aceg4.2\)c0
Zyxel Ex5600-T1 Firmware: before 5.70\(acdz.3.4\)c0 — fixed in 5.70\(acdz.3.4\)c0
Zyxel Ex5601-T0 Firmware: before 5.70\(acdz.3.4\)c0 — fixed in 5.70\(acdz.3.4\)c0

How to fix

Upgrade to a fixed version: Zyxel AX7501-B0 firmware 5.17\(abpc.5.3\)c0; Zyxel AX7501-B1 firmware 5.17\(abpc.5.3\)c0; Zyxel DX3300-T0 firmware 5.50\(aby.5.4\)c0; Zyxel DX3300-T1 firmware 5.50\(aby.5.4\)c0; Zyxel DX3301-T0 firmware 5.50\(aby.5.4\)c0; Zyxel Dx4510-B0 Firmware 5.17\(abyl.8\)c0; Zyxel Dx4510-B1 Firmware 5.17\(abyl.8\)c0; Zyxel DX5401-B0 firmware 5.17\(abyo.6.4\)c0; Zyxel Dx5401-B1 Firmware 5.17\(abyo.6.4\)c0; Zyxel Ee6510-10 Firmware 5.19\(acjq.1\)c0; Zyxel Emg3525-T50B Firmware 5.50\(abpm.9.3\)c0; Zyxel Emg5523-T50B Firmware 5.50\(abpm.9.3\)c0. Check the vendor advisory for mitigations.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-and-post-authentication-command-injection-vulnerabilities-in-some-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-and-wifi-extenders-12-03-2024

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