CVE-2020-17144
Published: November 3, 2021
Official Description
Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.
CISA KEV Advisory
Microsoft Exchange Server Remote Code Execution Vulnerability
Microsoft Exchange Server improperly validates cmdlet arguments which allow an attacker to perform remote code execution.
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Microsoft Exchange Server allows an attacker to perform remote code execution due to improper validation of cmdlet arguments. Rated as HIGH severity with a very high EPSS score, this indicates a significant likelihood of exploitation. Its presence in CISA's KEV confirms it has been actively exploited.
This vulnerability has been actively exploited in the wild and is part of CISA's KEV, confirming its use in real-world attacks. The flaw allows for remote code execution.
It is critical to apply all available security updates for Microsoft Exchange Server. Ensure that Exchange servers are regularly patched and follow Microsoft's security best practices.
Technical Analysis
CVE-2020-17144 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-2020-17144 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-2020-17144 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