CVE-2020-1147 [Exploited] | Microsoft .NET CORE RCE

CVE-2020-1147 is rated Critical Active Threat (91.1/100): CVSS High severity, with high exploitation likelihood (EPSS 93.43%, 100th percentile). CISA KEV confirms active exploitation (added 2021-11-03) affecting Microsoft / .NET Framework, SharePoint, Visual Studio. Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

EDB-ID	Source	Kind	Published	Link
50151	exploit_db	edb	2021-07-23	Exploit-DB ↗
48747	exploit_db	edb	2020-08-17	Exploit-DB ↗
—	nvd_ref	exploit_tag		Exploit-DB ↗
—	nvd_ref	exploit_tag		Exploit-DB ↗
—	nvd_ref	exploit_tag		Exploit-DB ↗
—	nvd_ref	exploit_tag		Exploit-DB ↗

EDB-ID

Source

Kind

Published

Link

50151

exploit_db

edb

2021-07-23

Exploit-DB ↗

48747

exploit_db

edb

2020-08-17

Exploit-DB ↗

—

nvd_ref

exploit_tag

Exploit-DB ↗

—

nvd_ref

exploit_tag

Exploit-DB ↗

—

nvd_ref

exploit_tag

Exploit-DB ↗

—

nvd_ref

exploit_tag

Exploit-DB ↗

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-06	93.50%	93.43%	-0.07%
2	2026-03-21	93.43%	93.50%	+0.07%
3	2025-12-28	—	93.43%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-06

93.50%

93.43%

-0.07%

2026-03-21

93.43%

93.50%

+0.07%

2025-12-28

—

93.43%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. 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.	1.8	5.9	[email protected]
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. 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.	1.8	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0
6.8	2.0	MEDIUM	`AV:N/AC:M/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:M) Exploitation needs some favorable conditions, but not exceptional ones. 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.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
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.

1.8

5.9

[email protected]

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
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.

1.8

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

6.8

2.0

MEDIUM

AV:N/AC:M/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:M): Exploitation needs some favorable conditions, but not exceptional ones.
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.

8.6

6.4

[email protected]

OS Trackers for CVE-2020-1147

vendor	priority	summary	link
`redhat`	critical	—	https://access.redhat.com/security/cve/CVE-2020-1147

vendor

priority

summary

link

redhat

critical

—

https://access.redhat.com/security/cve/CVE-2020-1147

Affected software / configurations for CVE-2020-1147

Vendor	Product	Version	Raw CPE
microsoft	.net_core	2.1	cpe:2.3:a:microsoft:.net_core:2.1:::::::*
microsoft	.net_core	3.1	cpe:2.3:a:microsoft:.net_core:3.1:::::::*
microsoft	.net_framework	2.0	cpe:2.3:a:microsoft:.net_framework:2.0:sp2::::::
microsoft	.net_framework	3.0	cpe:2.3:a:microsoft:.net_framework:3.0:sp2::::::
microsoft	.net_framework	3.5	cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
microsoft	.net_framework	4.6.2	cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
microsoft	.net_framework	4.7	cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
microsoft	.net_framework	4.7.1	cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
microsoft	.net_framework	4.7.2	cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
microsoft	.net_framework	4.6	cpe:2.3:a:microsoft:.net_framework:4.6:::::::*
microsoft	.net_framework	4.6.1	cpe:2.3:a:microsoft:.net_framework:4.6.1:::::::*
microsoft	.net_framework	4.8	cpe:2.3:a:microsoft:.net_framework:4.8:::::::*
microsoft	.net_framework	3.5.1	cpe:2.3:a:microsoft:.net_framework:3.5.1:::::::*
microsoft	.net_framework	4.5.2	cpe:2.3:a:microsoft:.net_framework:4.5.2:::::::*
microsoft	sharepoint_enterprise_server	2013	cpe:2.3:a:microsoft:sharepoint_enterprise_server:2013:sp1::::::
microsoft	sharepoint_enterprise_server	2016	cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:::::::*
microsoft	sharepoint_server	2010	cpe:2.3:a:microsoft:sharepoint_server:2010:sp2::::::
microsoft	sharepoint_server	2019	cpe:2.3:a:microsoft:sharepoint_server:2019:::::::*
microsoft	visual_studio_2017	>= 15.0, <= 15.9	cpe:2.3:a:microsoft:visual_studio_2017::::::::
microsoft	visual_studio_2019	>= 16.0, <= 16.6	cpe:2.3:a:microsoft:visual_studio_2019::::::::

References for CVE-2020-1147

URL	Tags
http://packetstormsecurity.com/files/158694/SharePoint-DataSet-DataTable-Deserialization.html	Exploit Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/158876/Microsoft-SharePoint-Server-2019-Remote-Code-Execution.html	Exploit Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/163644/Microsoft-SharePoint-Server-2019-Remote-Code-Execution.html	Exploit Third Party Advisory VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1147	Patch Vendor Advisory
https://www.exploitalert.com/view-details.html?id=35992	Exploit Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1147	US Government Resource

URL

CVE-2020-1147

CISA KEV Record for CVE-2020-1147

Public exploit references (Exploit-DB) for CVE-2020-1147

Exploit prediction scoring system (EPSS) score for CVE-2020-1147

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1147

Weakness enumeration for CVE-2020-1147

GitHub Security Advisory for CVE-2020-1147

OS Trackers for CVE-2020-1147

Affected software / configurations for CVE-2020-1147

References for CVE-2020-1147