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CVE-2021-33739

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

CVSS 3.18.4HighEPSS percentile94th6.6% chance in 30 daysCISA KEVListedsince 2021-11-03, due 2021-11-17
Public exploit: 1 sourceFix2 products4 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 10 Version 1909Affected: ≥ 10.0.0, < 10.0.18363.1621Upgrade to: 10.0.18363.1621Affected: ≥ 10.0.0, < 10.0.19043.1052Upgrade to: 10.0.19043.1052Affected: ≥ 10.0.0, < 10.0.19041.1052Upgrade to: 10.0.19041.1052Affected: ≥ 10.0.0, < 10.0.19042.1052Upgrade to: 10.0.19042.1052Stated by: CVE record
  • Microsoft Windows Server version 2004Affected: ≥ 10.0.0, < 10.0.19041.1052Upgrade to: 10.0.19041.1052Affected: ≥ 10.0.0, < 10.0.19042.1052Upgrade to: 10.0.19042.1052Stated by: CVE record

Versions as the sources state them. 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

Microsoft DWM Core Library Elevation of Privilege 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.

EPSS94th
Public exploit
CISA KEV
CISA KEV

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

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

Apply updates per vendor instructions.
Public exploits

1 source with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

6.6% chance of exploitation activity in the next 30 days, which ranks it in the 94th percentile of scored CVEs.

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

Lifecycle

The patch came 127 days before any public exploit.

  1. OpenVAS check added
  2. EPSS band changemoderate → low
  3. Public exploit / PoCsource: github-poc
  4. Patch availablerecord updated
  5. Added to CISA KEV
  6. Publishedweakness classified

Affected products

And 16 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 8.4 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • 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 HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

Sources

References in the record

And 4 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 Windows 10 Version 1909, not every advisory. This one: actively exploited.