CVE-2024-37981

Secure Boot bypass via undisclosed integer underflow

Published Jul 9, 2024 · Updated Feb 10, 2026

Integer underflow in Secure Boot in affected Microsoft Windows releases allows attackers to bypass boot verification via boot media. Microsoft has not published the affected function, arithmetic operation, or malformed input that triggers the underflow. Exploitation requires adjacent access and user interaction, and successful bypass can undermine pre-OS trust protections.

CVSS severity8.0
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Secure Boot in affected Microsoft Windows releases allows attackers to bypass boot verification via boot media. Microsoft has not published the affected function, arithmetic operation, or malformed input that triggers the underflow. Exploitation requires adjacent access and user interaction, and successful bypass can undermine pre-OS trust protections.

The record

CVE
CVE-2024-37981
Published
Jul 9, 2024
Updated
Feb 10, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-191, T1542.003
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=10.0.17763.0 <10.0.17763.6054

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.6054
Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.3079
Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.4651
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1009
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.3880
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.4651
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.6054
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.3880
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.3880
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.2582
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.6054

Published CVSS scores

8.0Microsoft CorporationCVSS:3.1/AV:A/AC:L/PR:N/UI:R/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1542.003Bootkit

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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