CVE-2020-0796
CRITICALCISA KEVEPSS 100th pctlDescription
A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.
How to fix
Actively exploited, no published fix found yet
CISA required action: Apply updates per vendor instructions.
Federal remediation due: 2022-08-10
Known ransomware campaign use
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 100% of all known CVEs.
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.
Remediation due: 2022-08-10
Associated with ransomware campaigns
References
Related Vulnerabilities
Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-4966 | Critical | 9.4 | 100% | KEV + Ransom | Fix |
| CVE-2017-11882 | High | 7.8 | 100% | KEV + Ransom | - |
| CVE-2008-4250 | Critical | 9.8 | 99% | KEV | - |
| CVE-2017-15944 | Critical | 9.8 | 98% | KEV | Fix |
| CVE-2015-0014 | High | 10.0 | 97% | - | - |
| CVE-2013-3182 | High | 7.8 | 96% | - | - |
Common questions
How do I fix CVE-2020-0796?
No published fix for CVE-2020-0796 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-08-10. Apply the vendor's mitigations per CISA's guidance.
Is CVE-2020-0796 being actively exploited?
Yes. CVE-2020-0796 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. CISA has also linked it to known ransomware campaigns. US federal agencies were required to remediate it by 2022-08-10. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2020-0796?
CVE-2020-0796 has a CVSS v3 base score of 10.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-29.