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CVE-2021-36942

Exploited in the wild. In CISA KEV since 2021‑11‑03. Fixed versions are out.

CVSS 3.17.5HighEPSS percentile99th66% chance in 30 daysCISA KEVListedsince 2021-11-03, due 2021-11-17
No public exploit knownFix5 products6 fixed builds listed below

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Microsoft Windows Server version 2004Affected: ≥ 10.0.0, < 10.0.19041.1165Upgrade to: 10.0.19041.1165Affected: ≥ 10.0.0, < 10.0.19042.1165Upgrade to: 10.0.19042.1165Stated by: CVE record
  • Microsoft Windows Server 2016Affected: ≥ 10.0.14393.0, < 10.0.14393.4583Upgrade to: 10.0.14393.4583Stated by: CVE record
  • Microsoft Windows Server 2019Affected: ≥ 10.0.17763.0, < 10.0.17763.2114Upgrade to: 10.0.17763.2114Stated by: CVE record
  • Microsoft Windows Server 2008 R2 Service Pack 1Affected: ≥ 6.1.7601.0, < 6.1.7601.25685Upgrade to: 6.1.7601.25685Stated by: CVE record
  • Microsoft Windows Server 2008 Service Pack 2Affected: ≥ 6.0.6003.0, < 6.0.6003.21192Upgrade to: 6.0.6003.21192Stated by: CVE record

Versions as the sources state them. 2 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

Coverage timeline

0 publishers

  1. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened.

What it is

From the CVE record

Windows LSA Spoofing Vulnerability

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS99th
CISA KEV
CISA KEV

Listed as exploited in the wild since 2021-11-03.

US federal agencies must remediate by 2021-11-17.

Known use in ransomware campaigns.

Apply updates per vendor instructions.
Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

66% chance of exploitation activity in the next 30 days, which ranks it in the 99th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

11 events over 1824 days, from the signal feeds we watch.

  1. Patch availablepatch available, record updated, record updated
  2. OpenVAS check added
  3. EPSS band changecritical → high
  4. Patch availablerecord updated
  5. Added to CISA KEVransomware campaign
  6. Publishedweakness classified

Affected products

And 26 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 7.5 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

And 3 more references. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Microsoft, not every advisory. This one: actively exploited.