CVE-2020-0796
Published: February 10, 2022
Official Description
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server or client.
CISA KEV Advisory
Microsoft SMBv3 Remote Code Execution Vulnerability
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target server or client.
Apply updates per vendor instructions.
Risk Analysis
This flaw in the Microsoft Server Message Block 3.1.1 (SMBv3) protocol can lead to remote code execution on affected servers or clients. The very high EPSS score suggests a strong probability of exploitation, and its presence in CISA's KEV confirms active exploitation, highlighting its critical nature.
This vulnerability is actively being exploited in the wild, meaning that functional exploits are circulating and being used by threat actors. It is remotely exploitable.
Apply the security updates released by Microsoft for the SMBv3 protocol. System administrators should prioritize patching all affected Windows systems to prevent remote code execution.
Technical Analysis
CVE-2020-0796 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-2020-0796 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-2020-0796 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