CVE-2020-0796

Exp

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'.

Published: 2020-03-12 Last update: 2025-10-29 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-0796 is rated Critical Active Threat (100/100): CVSS Critical severity, with high exploitation likelihood (EPSS 94.44%, 100th percentile). CISA KEV confirms active exploitation (added 2022-02-10) affecting Microsoft / SMBv3. a weakness (CWE-119) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2020-0796

Name: Microsoft SMBv3 Remote Code Execution Vulnerability · CISA KEV detail

Exploit added: 2022-02-10

Action due: 2022-08-10

Required action: Apply updates per vendor instructions.

Public exploit references (Exploit-DB) for CVE-2020-0796

EDB-ID Source Kind Published Link
48537 exploit_db edb 2020-06-02 Exploit-DB ↗
48267 exploit_db edb 2020-03-30 Exploit-DB ↗
48216 exploit_db edb 2020-03-14 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-0796

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 94.17% 94.44% +0.27%
2 2025-11-18 94.42% 94.17% -0.25%
3 2025-03-17 — 94.42% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-0796

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2020-0796

Affected software / configurations for CVE-2020-0796

Vendor Product Version Raw CPE
microsoft windows_10_1903 — cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*
microsoft windows_10_1903 — cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*
microsoft windows_10_1903 — cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x86:*
microsoft windows_10_1909 — cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:arm64:*
microsoft windows_10_1909 — cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x64:*
microsoft windows_10_1909 — cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:x86:*
microsoft windows_server_1903 — cpe:2.3:o:microsoft:windows_server_1903:-:*:*:*:*:*:x64:*
microsoft windows_server_1909 — cpe:2.3:o:microsoft:windows_server_1909:-:*:*:*:*:*:x64:*

References for CVE-2020-0796

URL Tags
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
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