CVE-2025-66635 Memory corruption in Web Config
A logged-in user can trigger a stack-based buffer overflow in Epson Web Config to execute arbitrary code.
- 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-2025-66635?
CVE-2025-66635 is a high-severity memory corruption vulnerability in SEIKO EPSON CORPORATION Web Config, published on 16 Dec 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Stack-based buffer overflow vulnerability exists in SEIKO EPSON Web Config. Specially crafted data input by a logged-in user may execute arbitrary code. As for the details of the affected products and versions, see the information provided by the vendor under [References].
Weakness: CWE-121
Which versions are affected by CVE-2025-66635?
How do I fix CVE-2025-66635?
No fix has been published for CVE-2025-66635 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-2025-66635 being exploited?
There is no known exploitation of CVE-2025-66635 in the wild and no public exploit code.
Sources
Also known as GHSA-3xxw-5cqg-mq5w.