Buffer overflow in Microsoft Windows 10 1903
CVE-2020-0796
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'.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.998 (100.0th percentile), scored .
Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.998 · newest: 0.998 · change: 0.000
Affected products
- Microsoft Windows 10 1903
- Microsoft Windows 10 1909
- Microsoft Windows 10 Version 1903 For 32-Bit Systems — versions unspecified
- Microsoft Windows 10 Version 1903 For Arm64-Based Systems — versions unspecified
- Microsoft Windows 10 Version 1903 For X64-Based Systems — versions unspecified
- Microsoft Windows 10 Version 1909 For 32-Bit Systems — versions unspecified
- Microsoft Windows 10 Version 1909 For Arm64-Based Systems — versions unspecified
- Microsoft Windows 10 Version 1909 For X64-Based Systems — versions unspecified
- Microsoft Windows Server 1903
- Microsoft Windows Server 1909
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796 (Patch, Vendor Advisory)
- packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-S… (VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/156732/Microsoft-Windows-SMB-3.1.1-Remote-Code-Ex… (Exploit, VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privi… (VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/157110/SMBv3-Compression-Buffer-Overflow.html (Exploit, VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Exe… (VDB Entry, Third Party Advisory)
- packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote… (VDB Entry, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2020-0796?
- CVE-2020-0796 is a critical-severity vulnerability in Microsoft Windows 10 1903, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 10.0/10. Published 2020-03-12.
- How severe is CVE-2020-0796?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2020-0796 known to be exploited?
- Yes. CVE-2020-0796 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-02-10), indicating it is being actively exploited. 471 public proof-of-concept repositories are indexed.