CVE-2025-11847Network attack vector

Service interruption via IP settings null dereference

Published Feb 24, 2026 · Updated Feb 24, 2026

Null pointer dereference in affected Zyxel VMG3625-T50B and WX3100-T0 firmware allows remote authenticated users to interrupt service. The IP settings CGI program dereferences a null pointer while processing a crafted HTTP request, terminating normal device operation. Administrator privileges and compromised user-configured credentials are required; WAN access is disabled by default.

CVSS severity4.9
Medium
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Null pointer dereference in affected Zyxel VMG3625-T50B and WX3100-T0 firmware allows remote authenticated users to interrupt service. The IP settings CGI program dereferences a null pointer while processing a crafted HTTP request, terminating normal device operation. Administrator privileges and compromised user-configured credentials are required; WAN access is disabled by default.

The record

CVE
CVE-2025-11847
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Zyxel Networks
Product
WX3100-T0 firmware
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 5.50(ABVL.4.8)C0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Zyxel Networks · WX3100-T0 firmwareversion=<= 5.50(ABVL.4.8)C0
Zyxel Networks · VMG3625-T50B Firmwareversion=<= 5.50(ABPM.9.6)C0

Published CVSS scores

4.9Zyxel CorporationCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo