Null Pointer Dereference Vulnerability in Zyxel Products
CVE-2025-11845

4.9MEDIUM

Key Information:

Vendor

Zyxel
Status
Vmg3625-t50b Firmware
Wx3100-t0 Firmware
Vendor
CVE Published:
24 February 2026

What is CVE-2025-11845?

A null pointer dereference vulnerability exists in the certificate downloader CGI program of specific Zyxel firmware versions. This flaw can be exploited by an authenticated attacker with administrator privileges, potentially leading to a denial-of-service (DoS) condition through a specially crafted HTTP request. It underscores the importance of timely firmware updates to mitigate risks associated with security vulnerabilities.

Affected Version(s)

VMG3625-T50B firmware <= 5.50(ABPM.9.6)C0

WX3100-T0 firmware <= 5.50(ABVL.4.8)C0

References

https://www.zyxel.com/global/en/support/security-advisori...
vendor-advisory

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.