7.5

CVE-2021-36942: Microsoft Windows Local Security Authority (LSA) Spoofing Vulnerability

CVSS: 7.5v3.1HighKEVRansomwareAnalyzed
Published 12-08-2021Last modified 10-08-2026
Open JSON

Vulnerability summary

CVE-2021-36942 is a high (CVSS 7.5) vulnerability in Microsoft Windows. It is known to be exploited: CISA lists it, first on 03-11-2021. It has been used in ransomware campaigns. EPSS estimates a 66.02% chance of exploitation in the next 30 days, higher than 99.2% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
90/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
66.02%
0%100%
Critical · 0.00 pp in 30 days
KEVListedCISA
RansomwareKnown useFlagged by CISA
Public exploits2reference, metasploit

Timeline

  1. 12-08-2021
    PublishedVulnerability first disclosed.
  2. 03-11-2021
    Added to CISA KEVMicrosoft Windows Local Security Authority (LSA) Spoofing Vulnerability
  3. 17-11-2021
    CISA remediation dueApply updates per vendor instructions.
  4. 10-08-2026
    Last modifiedVulnerability information updated.

Description

Windows LSA Spoofing Vulnerability

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

66.02%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

0.00 pp

From 66.02% on 19-09-2026

19-09-202619-10-2026
EPSS score
66.02%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-11-2021
Federal due date
17-11-2021
Ransomware

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2021-36942

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (kb.cert.org)

    Maturity: unknown

  • MetasploitMetasploitremoteUnverified

    PetitPotam

    auxiliary/scanner/dcerpc/petitpotam

    Maturity: poc

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft17 products

1 vendor · 17 products

References

4 links