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CVE-2024-8748

HIGH
7.5
CVSS Score
Published: December 3, 2024 at 01:15 AM UTC
Updated: June 17, 2026 at 08:23 AM UTC
125 products affected across 1 vendorEmg5523-t50b FirmwareEmg3525-t50b FirmwareVmg8623-t50b Firmware

Using VMG8825-T50K firmware by Zyxel?

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

AX7501-B0 firmware· Zyxel
95%
v ≤ 5.17(abpc.5.2)c0v < 5.17(abpc.5.3)c0
Affected range stops below 5.17(abpc.5.3)c0, so it looks safe — our inference, not a vendor statement
zyxel-ax7501-b0 (same device)
Ax7501-b1· Zyxel
95%
v ≤ 5.17(abpc.5.2)c0v < 5.17(abpc.5.3)c0
Affected range stops below 5.17(abpc.5.3)c0, so it looks safe — our inference, not a vendor statement
DX3300-T0 firmware· Zyxel
95%
v ≤ 5.50(abvy.5.3)c0v < 5.50(aby.5.4)c0
Affected range stops below 5.50(aby.5.4)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx3300-t0 (same device)
DX3300-T1 firmware· Zyxel
95%
v ≤ 5.50(abvy.5.3)c0v < 5.50(aby.5.4)c0
Affected range stops below 5.50(aby.5.4)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx3300-t1 (same device)
DX3301-T0 firmware· Zyxel
95%
v ≤ 5.50(abvy.5.3)c0v < 5.50(aby.5.4)c0
Affected range stops below 5.50(aby.5.4)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx3301-t0 (same device)
Dx4510-b0 Firmware· Zyxel
95%
v ≤ 5.17(abyl.7)c0v < 5.17(abyl.8)c0
Affected range stops below 5.17(abyl.8)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx4510-b0 (same device)
Dx4510-b1 Firmware· Zyxel
95%
v ≤ 5.17(abyl.7)c0v < 5.17(abyl.8)c0
Affected range stops below 5.17(abyl.8)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx4510-b1 (same device)
DX5401-B0 firmware· Zyxel
95%
v ≤ 5.17(abyo.6.3)c0v < 5.17(abyo.6.4)c0
Affected range stops below 5.17(abyo.6.4)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx5401-b0 (same device)
Dx5401-b1 Firmware· Zyxel
95%
v ≤ 5.17(abyo.6.3)c0v < 5.17(abyo.6.4)c0
Affected range stops below 5.17(abyo.6.4)c0, so it looks safe — our inference, not a vendor statement
zyxel-dx5401-b1 (same device)
Ee6510-10 Firmware· Zyxel
95%
v ≤ 5.19(acjq.0)c0v < 5.19(acjq.1)c0
Affected range stops below 5.19(acjq.1)c0, so it looks safe — our inference, not a vendor statement
zyxel-ee6510-10 (same device)

References (1)

Vendor Advisory
Source: [email protected]
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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHZyxel
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-120

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