CVE-2020-0796: in the CISA KEV catalogue
Microsoft SMBv3 Remote Code Execution Vulnerability. CISA added CVE-2020-0796 to the Known Exploited Vulnerabilities catalogue on 2022-02-10 with a default due date of 2022-08-10. Known ransomware campaign use: Known. Forensic triage flag: No.
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 description)
- Vendor / product
- Microsoft SMBv3
- CWE
- CWE-119
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 100%, percentile 99 (scored 2026-11-03)
EPSS puts nearly every time in 100 odds (100%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2020-0796 in the CISA KEV catalogue?
Yes. CISA added CVE-2020-0796 (Microsoft SMBv3 Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-02-10. CISA's default due date for it is 2022-08-10.
Is CVE-2020-0796 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2020-0796.
What should I do about CVE-2020-0796?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2020-0796