Security Resilience

CVE-2021-36942

Microsoft Windows Server 2008 r2

CISA KEVActive ExploitationEUVD ExploitedPublic PoCRansomware-linked
Published
12 August 2021
Modified
10 August 2026
KEV Added
03 November 2021
Patch / advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.66 99.3th percentile
Risk Priority 84 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2021-36942 is a high-severity an unspecified weakness vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 0.7% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2021-36942 is a spoofing vulnerability affecting the Local Security Authority (LSA) component in Windows. It carries a CVSS 3.1 base score of 7.5 with a vector indicating network attack vector, low attack complexity, no required privileges or user interaction, and high impact to confidentiality.

An unauthenticated attacker can exploit the flaw remotely to spoof LSA communications and obtain sensitive information from the affected system.

Microsoft security advisories and related CERT coordination guidance address mitigation steps, while the vulnerability appears in CISA's catalog of known exploited vulnerabilities in the wild.

EU & UK References

Vulnerability Data

Windows LSA Spoofing Vulnerability

CWE(s)
KEV Date Added
03 November 2021

Related Threats

Threat-Actor AttributionAI

Microsoft Corp. (Salesforce / Slack engineer recruitment claims)
NSA and CISA Red and Blue Teams Share Top Ten Cybersecurity Misconfigurations | CISA
AnonOps
NSA and CISA Red and Blue Teams Share Top Ten Cybersecurity Misconfigurations | CISA

CVEs Like This One

CVE-2021-42278Same product: Microsoft Windows Server 2004both on KEV
CVE-2021-42287Same product: Microsoft Windows Server 2004both on KEV
CVE-2020-1350Same product: Microsoft Windows Server 2008both on KEV
CVE-2020-1040Same product: Microsoft Windows Server 2008both on KEV
CVE-2021-34484Same product: Microsoft Windows Server 2004both on KEV
CVE-2021-31979Same product: Microsoft Windows Server 2004both on KEV
CVE-2021-31201Same product: Microsoft Windows Server 2004both on KEV
CVE-2021-31199Same product: Microsoft Windows Server 2004both on KEV
CVE-2023-29336Same product: Microsoft Windows Server 2008both on KEV
CVE-2021-31956Same product: Microsoft Windows Server 2004both on KEV

Affected Assets

microsoft
windows server 2004
≤ 10.0.19041.1165
microsoft
windows server 2008
all versions, r2
microsoft
windows server 2012
all versions, r2
microsoft
windows server 2016
≤ 10.0.14393.4583
microsoft
windows server 2019
≤ 10.0.17763.2114
microsoft
windows server 20h2
≤ 10.0.19042.1165

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References