CVE-2024-43522

Local privilege escalation via LSA heap overflow

Published Oct 8, 2024 · Updated Aug 19, 2026

Heap-based buffer overflow in Windows LSA on affected Windows 11 builds allows local users to elevate privileges via local actions. Microsoft identifies an overflow of a heap-allocated buffer in LSA but does not disclose the specific routine, malformed input, or bounds-checking error. Exploitation requires local low-privileged access and high attack complexity; success grants elevated privileges and enables compromise of system data and availability.

CVSS severity7.0
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Windows LSA on affected Windows 11 builds allows local users to elevate privileges via local actions. Microsoft identifies an overflow of a heap-allocated buffer in LSA but does not disclose the specific routine, malformed input, or bounds-checking error. Exploitation requires local low-privileged access and high attack complexity; success grants elevated privileges and enables compromise of system data and availability.

The record

CVE
CVE-2024-43522
Published
Oct 8, 2024
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Windows 11 Version 22H3
Classifications
CWE-122, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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=10.0.22631.0 <10.0.22631.4317

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.4317
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.4317
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.4317

Published CVSS scores

7.0Microsoft CorporationCVSS:3.1/AV:L/AC:H/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.

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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1068Exploitation for Privilege Escalation

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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