Is CVE-2020-0796 in the CISA KEV catalog?

Yes. CVE-2020-0796 is on the CISA Known Exploited Vulnerabilities list, added 2022-02-10, and has known ransomware campaign use.

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

CVE-2020-0796 has a CVSS v3 base score of 10.0 (CRITICAL).

What is the EPSS score for CVE-2020-0796?

CVE-2020-0796 has an EPSS score of 99.81% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2020-0796?

No published fix for CVE-2020-0796 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-08-10. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2020-0796

CRITICALCISA KEVEPSS 100th pctl

10.0

CVSS v3

NVD

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'.

CWE-119Buffer Overflow

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-08-10

Known ransomware campaign use

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

99.81%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft SMBv3 Remote Code Execution Vulnerability

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.

Apply updates per vendor instructions.

Remediation due: 2022-08-10

Associated with ransomware campaigns

References

Patch1

portal.msrc.microsoft.com

Exploit2

Third-Party Advisory4

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-
CVE-2015-3105	High	10.0	96%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-29.