CVE-2025-70616Public exploit

Kernel code execution via unchecked IOCTL length

Published Mar 5, 2026 · Updated Mar 5, 2026

Stack buffer overflow in Wincor Nixdorf wnBios64.sys 1.2.0.0 allows local users to execute kernel code via a crafted IOCTL request. The 0x80102058 handler uses the user-controlled Options value as the memmove length without limiting it to the 40-byte Src stack buffer, then copies the same length back to user space. Access to the driver device is required; oversized requests disclose kernel stack data, corrupt the kernel stack, and can crash Windows.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Wincor Nixdorf wnBios64.sys 1.2.0.0 allows local users to execute kernel code via a crafted IOCTL request. The 0x80102058 handler uses the user-controlled Options value as the memmove length without limiting it to the 40-byte Src stack buffer, then copies the same length back to user space. Access to the driver device is required; oversized requests disclose kernel stack data, corrupt the kernel stack, and can crash Windows.

The record

CVE
CVE-2025-70616
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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