CVE-2025-7673 Memory corruption in VMG8825-T50K firmware
Unauthenticated attackers can cause denial of service or execute arbitrary code via a buffer overflow in the Zyxel VMG8825-T50K web server URL parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-7673?
CVE-2025-7673 is a critical memory corruption vulnerability in Zyxel VMG8825-T50K firmware, published on 16 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.
Weakness: CWE-120
Which versions are affected by CVE-2025-7673?
It affects 24 products.
Products include Zyxel Emg3525-T50b Firmware, Zyxel Emg5523-T50b Firmware, Zyxel Emg5723-T50k Firmware, Zyxel Emg6726-B10a Firmware, Zyxel Ex3510-B0 Firmware, Zyxel Ex5510-B0 Firmware and 18 more.
How do I fix CVE-2025-7673?
No fix has been published for CVE-2025-7673 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-7673 being exploited?
There is no known exploitation of CVE-2025-7673 in the wild and no public exploit code.
Sources
Also known as GHSA-r3pp-h225-m34v.