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CVE-2021-42292

Exploited in the wild. In CISA KEV since 2021‑11‑17. Fixed versions are out.

CVSS 3.17.8HighEPSS percentile99th43% chance in 30 daysCISA KEVListedsince 2021-11-17, due 2021-12-01
No public exploit knownFix5 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 365 Apps for EnterpriseAffected: ≥ 16.0.1, < https://aka.ms/OfficeSecurityReleasesUpgrade to: https://aka.ms/OfficeSecurityReleasesStated by: CVE record
  • Microsoft Excel 2013 Service Pack 1Affected: ≥ 15.0.0.0, < 15.0.5397.1001Upgrade to: 15.0.5397.1001Affected: ≥ 16.0.0.0, < 16.0.5239.1001Upgrade to: 16.0.5239.1001Stated by: CVE record
  • Microsoft Office 2013 Service Pack 1Affected: ≥ 15.0.0, < 15.0.5397.1001Upgrade to: 15.0.5397.1001Affected: ≥ 16.0.0, < 16.0.5239.1001Upgrade to: 16.0.5239.1001Affected: ≥ 19.0.0, < https://aka.ms/OfficeSecurityReleasesUpgrade to: https://aka.ms/OfficeSecurityReleasesAffected: ≥ 16.0.1, < https://aka.ms/OfficeSecurityReleasesUpgrade to: https://aka.ms/OfficeSecurityReleasesStated by: CVE record
  • Microsoft Office 2019 for MacAffected: ≥ 16.0.0, < 16.55.21111400Upgrade to: 16.55.21111400Stated by: CVE record
  • Microsoft Office LTSC for Mac 2021Affected: ≥ 16.0.1, < 16.55.21111400Upgrade to: 16.55.21111400Stated 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 Excel Security Feature Bypass 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 2021-11-17.

US federal agencies must remediate by 2021-12-01.

Apply updates per vendor instructions.
Public exploits

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

EPSS

43% 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

8 events over 1743 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. OpenVAS check added
  3. Patch availablerecord updated
  4. Added to CISA KEV
  5. 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:R/S:U/C:H/I:H/A:H

Scored 7.8 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 RequiredA user must click a link, open a file, or perform some action

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 1 more reference. See all after sign-in

Watch the software you run.

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