CVE-2021-26870: Windows Projected File System Elevation of Privilege Vulnerability
Windows Projected File System Elevation of Privilege Vulnerability
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19043.867Patch KB5000802 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.18363.1440Patch KB5000808 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.1817Patch KB5000822 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17134.2087Patch KB5000809
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this vulnerability?
An attacker needs local access and low privileges on the affected Windows system. No user interaction is required.
What could successful exploitation allow?
Successful exploitation could allow elevation of privilege, with high impact to confidentiality, integrity, and availability.
Which systems should be prioritized for remediation?
Prioritize Microsoft Windows 10, Windows Server 2016, and Windows Server 2019 systems, especially those where untrusted or low-privileged users can execute code locally.