CVE-2021-36942

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.660 · 99 %ileexploit · functionalEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 1 exploit · functional

Likely / severe?

66.0% (99th) EPSS

CVSS 5 · medium

Is it mine?

67 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

added 2021-11-03remediate by 2021-11-17

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-27

Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability

Windows LSA Spoofing Vulnerability

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088
https://support.microsoft.com/help/5005088
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)msrc_csaf
6.1.7601.25685:Monthly Rollup:https://support.microsoft.com/help/5005088
https://support.microsoft.com/help/5005088
FixedWindows Server 2008 for 32-bit Systems Service Pack 2msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2008 for x64-based Systems Service Pack 2msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21192:Monthly Rollup:https://support.microsoft.com/help/5005090
https://support.microsoft.com/help/5005090
FixedWindows Server 2012msrc_csaf
6.2.9200.23435:Security Only:https://support.microsoft.com/help/5005094
https://support.microsoft.com/help/5005094
FixedWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.23435:Security Only:https://support.microsoft.com/help/5005094
https://support.microsoft.com/help/5005094
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows Server 2016msrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows Server 2019msrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows Server, version 2004 (Server Core installation)msrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows Server, version 20H2 (Server Core Installation)msrc_csaf
10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033

cvss

Technical severity, 0–10. One row per scoring source.

8.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–8.2

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:N/E:Hsecondary · CVSS-BT (t0sche)

v3.18.2highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · secure@microsoft.com USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:Csecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · NVD / NIST USexploitability 3.9 · impact 3.6

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-451US

exploits (1)

Public proof-of-concept and weaponised exploit code.

auxiliary/scanner/dcerpc/petitpotamPetitPotamfunctional · metasploit

affected products (67)

Products and version ranges known to be affected.

Microsoft Windows Server 2008 R2 Service Pack 16.1.7601.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.1.7601.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 26.0.6003.0 → 6.0.6003.21192enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)6.0.6003.0 → 6.0.6003.21192enisa_euvdEU
Microsoft Windows Server 20126.2.9200.0 → 6.2.9200.23435enisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.9200.0 → 6.2.9200.23435enisa_euvdEU
Microsoft Windows Server 2012 R26.3.9600.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.9600.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 201610.0.14393.0 → 10.0.14393.4583enisa_euvdEU
Microsoft Windows Server 2016 (Server Core installation)10.0.14393.0 → 10.0.14393.4583enisa_euvdEU
Microsoft Windows Server 201910.0.17763.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Windows Server 2019 (Server Core installation)10.0.17763.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Windows Server version 200410.0.0 → 10.0.19041.1165enisa_euvdEU
Microsoft Windows Server version 20H210.0.0 → 10.0.19042.1165enisa_euvdEU
Microsoft Corp Windows Server 2004 (Server Core Installation)all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 R2 Service Pack 1all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 R2 Service Pack 1 (Server Core installation)all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 Service Pack 2all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 Service Pack 2 (Server Core Installation)all versionsfstec_bduRU
Microsoft Corp Windows Server 2012all versionsfstec_bduRU

showing 20 of 67

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-36942Windows LSA Spoofing Vulnerability2021-08-10csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf NVD CVE.org MITRE

published 2021-08-12modified 2026-08-10

references (11)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan