⚠ Actively exploited
Added to CISA KEV on 2021-11-03. Federal agencies required to patch by 2022-05-03. Required action: Apply updates per vendor instructions..

CVE-2020-1054 — Out-of-bounds Write in Microsoft Windows

CWE-787 — Out-of-bounds WriteCWE-269 — Improper Privilege Management10 documents9 sources
Severity
7.8HIGHNVD
EPSS
80.9%
top 0.85%
CISA KEV
KEV
Added 2021-11-03
Due 2022-05-03
Exploit
Exploited in wild
Active exploitation observed
Affected products
10
Microsoft WindowsMicrosoft Windows 10 Version 1903 FOR 32-bit SystemsMicrosoft Windows 10 Version 1903 FOR Arm64-based Systems+7 more
Timeline
PublishedMay 21
KEV addedNov 3
KEV dueMay 3
Latest updateMay 24
CISA Required Action: Apply updates per vendor instructions.

Description

An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2020-1143.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages9 packages

▶CVEListV5microsoft/windows18 versions+17
▶CVEListV5microsoft/windows_server17 versions+16

Patches

Patch: portal.msrc.microsoft.com ↗Patch: portal.msrc.microsoft.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-5qfv-hvxp-fg32: An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory, aka 'Win32k↗2022-05-24
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CVEList
CVE-2020-1054: An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory, aka 'Win32k↗2020-05-21
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VulnCheck
Microsoft Win32k Privilege Escalation Vulnerability↗2020
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💥Exploits & PoCs

1
Metasploit
Microsoft Windows DrawIconEx OOB Write Local Privilege Elevation↗
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📋Vendor Advisories

2
CISA
Microsoft Win32k Privilege Escalation Vulnerability↗2021-11-03
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Microsoft
Win32k Elevation of Privilege Vulnerability↗2020-05-12
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🕵️Threat Intelligence

2
Sentinelone
Purple Fox EK | New CVEs, Steganography, and Virtualization Added to Attack Flow - SentinelLabs↗2020-10-19
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Sentinelone
Purple Fox EK | New CVEs, Steganography, and Virtualization Added to Attack Flow↗2020-10-19
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💬Community

1
Bugzilla
CVE-2018-10805 ImageMagick: Memory leak in ReadYCBCRImage↗2018-05-11
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CVE-2020-1054 — Out-of-bounds Write in Microsoft | cvebase