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CVE-2020-0796

Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS 3.1 Critical 10.0Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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'.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 Critical 10.0

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Changed

    The impact can reach other components beyond the vulnerable one.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.99810 (99.8% probability)
Percentile
99.95%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Microsoft SMBv3 Remote Code Execution Vulnerability
Added to the catalog
Feb 10, 2022
Federal due date
Aug 10, 2022
Ransomware campaigns
Known use

CISA assessment as of Aug 12, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
yes
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Affected products

Products listed in the CVE record, as the CNA published them.

  • Microsoft Windows 10 Version 1903 for 32-bit Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1903 for x64-based Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1903 for ARM64-based Systems

    • affected: unspecified

  • Microsoft Windows Server, version 1903 (Server Core installation)

    • affected: unspecified

  • Microsoft Windows 10 Version 1909 for 32-bit Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1909 for x64-based Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1909 for ARM64-based Systems

    • affected: unspecified

  • Microsoft Windows Server, version 1909 (Server Core installation)

    • affected: unspecified

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:33 UTC. Sources and licenses