CVE-2025-11848 Null dereference in VMG3625-T50B firmware
An authenticated administrator can cause a denial-of-service condition in Zyxel routers by sending a crafted HTTP request to the Wake-on-LAN CGI program.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-11848?
CVE-2025-11848 is a medium-severity vulnerability in Zyxel VMG3625-T50B firmware, published on 24 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A null pointer dereference vulnerability in the Wake-on-LAN CGI program of the Zyxel VMG3625-T50B firmware version 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.
Weakness: CWE-476
Which versions are affected by CVE-2025-11848?
It affects 48 products.
Products include Zyxel Ax7501-B1 Firmware, Zyxel Dx3300-T0 Firmware, Zyxel Dx3300-T1 Firmware, Zyxel Dx3301-T0 Firmware, Zyxel Dx4510-B0 Firmware, Zyxel Dx4510-B1 Firmware and 42 more.
How do I fix CVE-2025-11848?
No fix has been published for CVE-2025-11848 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-11848 being exploited?
There is no known exploitation of CVE-2025-11848 in the wild and no public exploit code.
Other vulnerabilities in Zyxel VMG3625-T50B firmware
Sources
Also known as GHSA-m8fj-fqgq-fj22.