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CVE-2023-21716

Exploitation likely. EPSS gives it a 85% chance of exploitation in the next 30 days. Fixed versions are out.

CVSS 3.19.8CriticalEPSS percentile99th85% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products3 fixed builds listed below
Check it yourself

OpenVAS · 9 checks

e.g. OID 1.3.6.1.4.1.25623.1.0.821363

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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 Office 2019Affected: ≥ 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, < 16.70.23021201Upgrade to: 16.70.23021201Stated by: CVE record
  • Microsoft Office LTSC for Mac 2021Affected: ≥ 16.0.1, < 16.70.23021201Upgrade to: 16.70.23021201Stated by: CVE record
  • Microsoft Office Online ServerAffected: ≥ 16.0.1, < 16.0.10395.20001Upgrade to: 16.0.10395.20001Stated by: CVE record

Versions as the sources state them. 11 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.

What it is

From the CVE record

Microsoft Word Remote Code Execution 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

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

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

EPSS

85% 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

9 events over 1282 days, from the signal feeds we watch.

  1. Patch availablerecord updated
  2. OpenVAS check added
  3. EPSS band changecritical → high
  4. Patch availablerecord updated
  5. Publishedweakness classified, att&ck mapped

Affected products

And 29 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:H/A:H

Scored 9.8 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 HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 1 more reference. See all after sign-in

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