CVE-2020-0646
Published: November 3, 2021
Official Description
Microsoft .NET Framework contains an improper input validation vulnerability that allows for remote code execution.
CISA KEV Advisory
Microsoft .NET Framework Remote Code Execution Vulnerability
Microsoft .NET Framework contains an improper input validation vulnerability that allows for remote code execution.
Apply updates per vendor instructions.
Risk Analysis
Microsoft .NET Framework contains an improper input validation vulnerability that can lead to remote code execution. With an EPSS score of 0.93865, the likelihood of exploitation is very high, and its inclusion in CISA's KEV confirms active exploitation, making this a critical vulnerability.
Active exploitation of this vulnerability has been observed in the wild, as indicated by its 'in_the_wild' exploit status and presence in CISA's KEV. The nature of the flaw suggests it can be exploited remotely.
Organizations should ensure all systems running Microsoft .NET Framework are fully updated with the latest security patches. Implementing robust input validation and secure coding practices can help prevent similar vulnerabilities.
Technical Analysis
CVE-2020-0646 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-2020-0646 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-2020-0646 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