CVE-2025-70616 Memory corruption in n/a
Local attackers can exploit a stack buffer overflow in the wnBios64.sys kernel driver to achieve kernel code execution and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-70616?
CVE-2025-70616 is a high-severity memory corruption vulnerability in n/a, published on 5 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A stack buffer overflow vulnerability exists in the Wincor Nixdorf wnBios64.sys kernel driver (version 1.2.0.0) in the IOCTL handler for code 0x80102058. The vulnerability is caused by missing bounds checking on the user-controlled Options parameter before copying data into a 40-byte stack buffer (Src[40]) using memmove. An attacker with local access can exploit this vulnerability by sending a crafted IOCTL request with Options > 40, causing a stack buffer overflow that may lead to kernel code execution, local privilege escalation, or denial of service (system crash). Additionally, the same IOCTL handler can leak kernel addresses and other sensitive stack data when reading beyond the buffer boundaries.
Weakness: CWE-121
Which versions are affected by CVE-2025-70616?
It affects 1 product.
Products include Dieboldnixdorf Wnbios64.sys.
How do I fix CVE-2025-70616?
No fix has been published for CVE-2025-70616 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-2025-70616 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-70616 exists.
Sources
Also known as GHSA-wcpg-p923-mr58.