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CVE-2021-31199

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

CVSS 3.15.2MediumEPSS percentile87th3.0% chance in 30 daysCISA KEVListedsince 2021-11-03, due 2021-11-17
No public exploit knownFix5 products7 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 1809Affected: ≥ 10.0.0, < 10.0.17763.1999Upgrade to: 10.0.17763.1999Affected: ≥ 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: 10.0.19041.1052 + 3 more branchesStated by: CVE record
  • Microsoft Windows Server 2019Affected: ≥ 10.0.0, < 10.0.17763.1999Upgrade to: 10.0.17763.1999Stated 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
  • Microsoft Windows Server 2016Affected: ≥ 10.0.0, < 10.0.14393.4467Upgrade to: 10.0.14393.4467Stated by: CVE record
  • Microsoft Windows 7Affected: ≥ 6.1.0, < 6.1.7601.25632Upgrade to: 6.1.7601.25632Stated by: CVE record

Versions as the sources state them. 5 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

Microsoft Enhanced Cryptographic Provider 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.

EPSS87th
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

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

EPSS

3.0% chance of exploitation activity in the next 30 days, which ranks it in the 87th percentile of scored CVEs.

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

Attention now

Rising.

Lifecycle

6 events over 1843 days, from the signal feeds we watch.

  1. OpenVAS check added
  2. Patch availablerecord updated
  3. Added to CISA KEV
  4. Publishedweakness classified

Affected products

And 57 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:L/UI:N/S:C/C:L/I:L/A:N

Scored 5.2 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 LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)

Impact if exploited

  • Confidentiality LowSome restricted information is disclosed, but limited in scope
  • Integrity LowData modification is possible but limited in scope or consequence
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

And 1 more reference. 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 7 Service Pack 1, not every advisory. This one: actively exploited.