CVE-2021-36942

Windows LSA Spoofing Vulnerability

Windows LSA Spoofing Vulnerability

Affected

Microsoft · Windows Server 2008 R2 Service Pack 1 · Windows Server 2008 R2 Service Pack 1 (Server Core installation) · Windows Server 2008 Service Pack 2 · Windows Server 2008 Service Pack 2 (Server Core installation) · Windows Server 2012 · Windows Server 2012 (Server Core installation)

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 MICROSOFT

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

66.02% chance of exploitation in the next 30 days, 99th percentile

CISA KEV

added 2021-11-03, used in ransomware campaigns

Published

2021-08-12

Updated

2026-08-10

Proof-of-concept exploits (5)

• Royalboy2000/codeRDPbreaker1★ · 2023-08-05
• XiaoliChan/PetitPotam-V226★ · 2023-03-21
• brettgus/PetitPotam0★ · 2025-02-26
• ly4k/PetitPotam227★ · 2021-10-17
• topotam/PetitPotam2283★ · 2024-08-15

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/dcerpc/petitpotam.rb

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942
• https://www.kb.cert.org/vuls/id/405600

References

• CVE Record
• NVD entry

Related

• CVE-2019-0708
• CVE-2021-34527
• CVE-2021-42278
• CVE-2021-42287
• CVE-2020-0601
• CVE-2021-4034