CVE-2021-26887
HighCVSS 7.8Exploitation Probability (EPSS)
Elevated risk58th percentile - higher than 58% of all known CVEs
Summary
Elevation of privilege vulnerability in Microsoft Windows when Folder redirection is enabled via Group Policy. An attacker could redirect another user's personal data to a created folder.
Risk Assessment
An attacker could gain access to other users' personal data.
Recommendation
Reconfigure Folder Redirection with Offline files and restrict permissions. No security update is available.
Other vulnerabilities in Microsoft Windows
See all- CVE-2017-8467High
In Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016, there is a vulnerability that allows elevation of privilege due to the way it handles objects in memory.
- CVE-2016-0009High
The vulnerability in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, and Windows 10 Gold and 1511 allows remote attackers to execute arbitrary code via unspecified vectors.
- CVE-2024-21412HighActively exploited
Security feature bypass vulnerability in Internet Shortcut Files. Allows an attacker to bypass system security features.
- CVE-2023-21823HighActively exploited
Windows Graphics Component Remote Code Execution Vulnerability. Details are not provided in the description, but it allows remote code execution.
- CVE-2021-41379MediumActively exploited
Windows Installer Elevation of Privilege Vulnerability. Details are not provided in the description, but it allows privilege escalation.
- CVE-2021-41357HighActively exploited
Win32k Elevation of Privilege Vulnerability. Technical details are not provided in the description, but it is a vulnerability allowing privilege escalation.
- CVE-2021-40450HighActively exploited
Win32k Elevation of Privilege Vulnerability. Technical details are not provided in the description, but it is a vulnerability allowing privilege escalation.
- CVE-2021-40449HighActively exploited
Win32k Elevation of Privilege Vulnerability. Technical details are not provided in the description, but it is a vulnerability allowing privilege escalation.
- CVE-2020-1472MediumActively exploited
An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted application on a device on the network. To exploit the vulnerability, an unauthenticated attacker would be required to use MS-NRPC to connect to a domain controller to obtain domain administrator access.
- CVE-2020-1054HighActively exploited
An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode, install programs, view/change/delete data, or create new accounts with full user rights.
Original NVD description (English source)
An elevation of privilege vulnerability exists in Microsoft Windows when Folder redirection has been enabled via Group Policy. When folder redirection file server is co-located with Terminal server, an attacker who successfully exploited the vulnerability would be able to begin redirecting another user's personal data to a created folder. To exploit the vulnerability, an attacker can create a new folder under the Folder Redirection root path and create a junction on a newly created User folder. When the new user logs in, Folder Redirection would start redirecting to the folder and copying personal data. This elevation of privilege vulnerability can only be addressed by reconfiguring Folder Redirection with Offline files and restricting permissions, and NOT via a security update for affected Windows Servers. See the FAQ section of this CVE for configuration guidance.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS