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CVE-2026-81581— User input in WibuKey is used (without proper sanitization) to compute the address of a pointer, which can be exploited to let the user point to any storage, to which Windows responds with a denial of service.

Quick assessment

Affected
wibu-systems-ag wibukey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WIBU-SYSTEMS WibuKey是德国WIBU-SYSTEMS公司的一款软件加密保护产品。 WIBU-SYSTEMS WibuKey 6.70及之前版本存在缓冲区错误漏洞，该漏洞源于对WibuKey64.sys内存边界验证不当，攻击者可设置指针超出程序范围，导致拒绝服务，也可能导致远程代码执行和权限提升（因为驱动程序以系统权限运行）。

CVSS 8.8 · High EPSS 0.22% · P13

Affected Version Matrix 1

VendorProduct Version RangeStatus
wibu-systems-ag wibukey < 6.71 affected
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I. Basic Information for CVE-2026-81581

Vulnerability Information
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Vulnerability Title
User input in WibuKey is used (without proper sanitization) to compute the address of a pointer, which can be exploited to let the user point to any storage, to which Windows responds with a denial of service.
Source: CVE Program / CVE List V5
Vulnerability Description
Improper validation of memory boundaries in WibuKey64.sys of WibuKey up to 6.70 for Windows can be exploited by an attacker by setting the pointers outside the scope of the program. This usually results in a denial of service, yet we cannot rule out the possibility of exploits that can cause Remote Code Execution and Privilege Escalation (since the driver runs with system privileges).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WIBU-SYSTEMS WibuKey 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WIBU-SYSTEMS WibuKey是德国WIBU-SYSTEMS公司的一款软件加密保护产品。 WIBU-SYSTEMS WibuKey 6.70及之前版本存在缓冲区错误漏洞，该漏洞源于对WibuKey64.sys内存边界验证不当，攻击者可设置指针超出程序范围，导致拒绝服务，也可能导致远程代码执行和权限提升（因为驱动程序以系统权限运行）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wibu-systems-ag wibukey 0 ~ 6.71 -

II. Public POCs for CVE-2026-81581

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III. Intelligence Information for CVE-2026-81581

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Vendor Advisories for CVE-2026-81581 (1)

Same Patch Batch · wibu-systems-ag · 2026-08-27 · 7 CVEs total

CVE-2026-81579 8.8 HIGH An untrusted Pointer Dereference can be exploited to escalate privileges by an unprivilege
CVE-2026-81573 8.6 HIGH Improper Access Control in Local-Only Configuration Commands
CVE-2026-81574 8.2 HIGH Format String Vulnerability in Logger
CVE-2026-81572 7.8 HIGH Local Privilege Escalation in CodeMeter Runtime on Windows
CVE-2026-81576 7.7 HIGH Improper Authentication of Session Handles
CVE-2026-81575 7.5 HIGH Missing Sanity Checks for Buffer Lengths

IV. Related Vulnerabilities

Same product: wibukey
Same vendor: wibu-systems-ag
Same weakness: CWE-119