CVEs / CVE-2020-0796
CVE-2020-0796: Microsoft SMBv3 Remote Code Execution Vulnerability
- Known exploited in the CISA KEV catalog since 10 Feb 2022
- critical 10 CVSS 3.1 (NVD)
- EPSS 99.8% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.
Check your servers with Stackurity Already using Stackurity? Search for CVE-2020-0796
Summary
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.
Description
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'.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1903 for 32-bit Systems | unspecified | — |
| Microsoft Windows 10 Version 1903 for x64-based Systems | unspecified | — |
| Microsoft Windows 10 Version 1903 for ARM64-based Systems | unspecified | — |
| Microsoft Windows Server, version 1903 (Server Core installation) | unspecified | — |
| Microsoft Windows 10 Version 1909 for 32-bit Systems | unspecified | — |
| Microsoft Windows 10 Version 1909 for x64-based Systems | unspecified | — |
| Microsoft Windows 10 Version 1909 for ARM64-based Systems | unspecified | — |
| Microsoft Windows Server, version 1909 (Server Core installation) | unspecified | — |
Exploitation
| In CISA KEV since | 10 Feb 2022 |
|---|---|
| Due date for US federal agencies | 10 Aug 2022 |
| Used in ransomware campaigns | Known |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 10 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-119 |
References
- CVE-2020-0796 on NVD
- CVE-2020-0796 in the CISA KEV catalog
- http://packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-Of-Concept.html Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156732/Microsoft-Windows-SMB-3.1.1-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation.html Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/157110/SMBv3-Compression-Buffer-Overflow.html Exploit, Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Execution.html Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution-Proof-Of-Concept.html Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0796 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.