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CVE-2025-11845

MEDIUM
4.9
CVSS Score
Published: February 24, 2026 at 01:30 AM UTC
Updated: June 17, 2026 at 08:31 AM UTC
55 products affected across 1 vendorEmg3525-t50b FirmwareEmg5523-t50b FirmwareVmg8623-t50b Firmware

Using VMG3625-T50B firmware by Zyxel?

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

A null pointer dereference vulnerability in the certificate downloader 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

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

Ax7501-b1· Zyxel
95%
v < 5.17(abpc.7.1)c0
DX3300-T0 firmware· Zyxel
95%
v < 5.50(abvy.7.1)c0
zyxel-dx3300-t0 (same device)
DX3300-T1 firmware· Zyxel
95%
v < 5.50(abvy.7.1)c0
zyxel-dx3300-t1 (same device)
DX3301-T0 firmware· Zyxel
95%
v < 5.50(abvy.7.1)c0
zyxel-dx3301-t0 (same device)
Dx4510-b0 Firmware· Zyxel
95%
v < 5.17(abyl.10.1)c0
zyxel-dx4510-b0 (same device)
Dx4510-b1 Firmware· Zyxel
95%
v < 5.17(abyl.10.1)c0
zyxel-dx4510-b1 (same device)
Dx5401-b1 Firmware· Zyxel
95%
v < 5.17(abyo.7.1)c0
zyxel-dx5401-b1 (same device)
Ee3301-00 Firmware· Zyxel
95%
v < 5.63(acmu.2.1)c0
zyxel-ee3301-00 (same device)
Ee5301-00 Firmware· Zyxel
95%
v < 5.63(acld.2.1)c0
zyxel-ee5301-00 (same device)
Ee6510-10 Firmware· Zyxel
95%
v < 5.19(acjq.4.1)c0
zyxel-ee6510-10 (same device)

References (1)

Vendor Advisory
Source: cverecord
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-null-pointer-dereference-and-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-security-routers-and-wireless-extenders-02-24-2026

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

4.9MEDIUMZyxel
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-476

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