CVE-2026-81581

System crash via unconstrained driver pointer

Published Aug 27, 2026 · Updated Aug 28, 2026

Improper memory-boundary validation in WibuKey64.sys for WIBU-SYSTEMS AG WibuKey 6.70 and earlier allows local users to crash Windows. The driver uses user-controlled input to compute a pointer without constraining the resulting address to valid memory boundaries. Low-privileged local access is required; the confirmed consequence is a Windows crash, while code execution and SYSTEM privilege escalation are not confirmed.

CVSS severity8.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper memory-boundary validation in WibuKey64.sys for WIBU-SYSTEMS AG WibuKey 6.70 and earlier allows local users to crash Windows. The driver uses user-controlled input to compute a pointer without constraining the resulting address to valid memory boundaries. Low-privileged local access is required; the confirmed consequence is a Windows crash, while code execution and SYSTEM privilege escalation are not confirmed.

The record

CVE
CVE-2026-81581
Published
Aug 27, 2026
Updated
Aug 28, 2026
Vendor
WIBU-SYSTEMS AG
Product
WibuKey
Classifications
CWE-119
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.71

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

WIBU-SYSTEMS AG · WibuKeyversion=0 <6.71

Published CVSS scores

8.8WIBU-SYSTEMS AGCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

No public exploit references are available in this record.

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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