What is the CVSS score of CVE-2020-0796?

CVE-2020-0796 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 99.8%.

Is there a public PoC exploit available for CVE-2020-0796?

Yes, a public proof-of-concept exploit is available for CVE-2020-0796. Prioritise patching immediately. EPSS: 99.8%.

Is there a patch available for CVE-2020-0796?

Yes, a patch is available for CVE-2020-0796. Update the affected software to the latest version immediately.

Windows 10 1909 CVE-2020-0796

CRITICAL

Buffer Overflow (CWE-119)

2020-03-12 secure@microsoft.com

RCE Buffer Overflow Microsoft Windows 10 1909 Windows 10 1903 Windows Server 1903 Windows Server 1909

10.0

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-119 ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 10.0 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	A remote attacker could corrupt memory to execute arbitrary code or crash the application by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 99.8% exploitation probability (EPSS)

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AnalysisAI

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. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Use memory-safe languages or bounds-checking. Enable ASLR, DEP/NX, stack canaries. Use safe string functions.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Buffer Overflow (CWE-119), which allows attackers to corrupt memory to execute arbitrary code or crash the application. 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 products include: Microsoft Windows 10 1903, Microsoft Windows 10 1909, Microsoft Windows Server 1903, Microsoft Windows Server 1909.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 10.0 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Mar 12, 2020 - 16:15 nvd

CRITICAL 10.0

DescriptionNVD

Threat Intelligence Overview

Threat Score

8.0/10

Composite threat intelligence

EPSS Score

99.8%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

7 sources

Confidence: High

NVD

CVE.org

CISA KEV

EPSS POC (3)

Exploit-DB

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV Yes

Public POC Yes

EPSS 99.8%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

High

Priority Score

235

Low Medium High Critical

KEV: +50

EPSS: +100

CVSS: +50

PoC: +20

Weaponized: +15

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

Affected Products (CPE)NVD

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_server_1903:-:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_1909:-:*:*:*:*:*:x64:*

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Same weakness CWE-119 – Buffer Overflow

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References

Advisories & patches

PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0796 ADVISORY https://vuldb.com/vuln/151392 REF http://packetstormsecurity.com/files/156731/CoronaBlue-SMBGhost-Microsoft-Windows-10-SMB-3.1.1-Proof-Of-Concept.html REF http://packetstormsecurity.com/files/156980/Microsoft-Windows-10-SMB-3.1.1-Local-Privilege-Escalation.html REF http://packetstormsecurity.com/files/157901/Microsoft-Windows-SMBGhost-Remote-Code-Execution.html REF http://packetstormsecurity.com/files/158054/SMBleed-SMBGhost-Pre-Authentication-Remote-Code-Execution-Proof-Of-Concept.html REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0796

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