CVE-2020-17087
Published: November 3, 2021
Official Description
Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.
CISA KEV Advisory
Microsoft Windows Kernel Privilege Escalation Vulnerability
Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.
Apply updates per vendor instructions.
Risk Analysis
An unspecified vulnerability in the Microsoft Windows kernel allows for privilege escalation. The high EPSS score and confirmed exploitation indicate this is an actively exploited vulnerability that could allow attackers to gain higher system privileges.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. The unspecified nature suggests a broad attack surface for privilege escalation.
Apply the latest security updates for Microsoft Windows to patch the kernel vulnerability. Implement the principle of least privilege for all user accounts to limit the impact of successful privilege escalation.
Technical Analysis
CVE-2020-17087 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2020-17087 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-17087 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1