CVE-2023-35305

Local privilege escalation via kernel heap overflow

Published Jul 11, 2023 · Updated Jan 1, 2025

Heap-based buffer overflow in the Microsoft Windows kernel allows local users on affected builds to elevate privileges. Microsoft identifies the Windows kernel and CWE-122 but has not disclosed the vulnerable function, input, or incorrect memory operation. Exploitation requires prior low-privilege access and can cross the kernel privilege boundary to obtain elevated control of the host.

CVSS severity7.8

High

EPSS probability0.43%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2023-35305
Published: Jul 11, 2023
Updated: Jan 1, 2025

Vendor: Microsoft
Product: Windows Server 2019
Classifications: CWE-122, T1068

Attack vector: local
Privileges: authenticated

Timeline

How it unfolded

Jul 11, 2023CVE publishedPublication date reported by the CVE source.
Jan 1, 2025Record 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.

Affected versionversion=10.0.17763.0 <10.0.17763.4645

What conditions does exploitation require?

Attack vectorlocal

Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.4645

Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.6085

Microsoft · Windows 11 version 21H2version=10.0.0 <10.0.22000.2176

Microsoft · Windows 10 Version 21H2version=10.0.19043.0 <10.0.19044.3208

Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.6085

Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.3208

Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.4645

Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.1992

Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.6085

Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.1850

Microsoft · Windows 10 Version 1809version=10.0.0 <10.0.17763.4645; version=10.0.17763.0 <10.0.17763.4645

Published CVSS scores

7.8Microsoft CorporationCVSS: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.

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)

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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