CVE-2023-21716
Exploitation likely. EPSS gives it a 85% chance of exploitation in the next 30 days. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
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.
- 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.
- Patch availablerecord updated
- OpenVAS check added
- EPSS band changecritical → high
- Patch availablerecord updated
- Publishedweakness classified, att&ck mapped
Affected products
- Microsoft Office Web Apps Server 2013 Service Pack 1Enterprise Software / collaboration-groupware
- Microsoft Word 2013 RT Service Pack 1Consumer Software / productivity
- Microsoft SharePoint FoundationEnterprise Software / document-mgmt
- Microsoft SharePoint Enterprise Server 2016Enterprise Software / document-mgmt
- Microsoft Word 2013 Service Pack 1Consumer Software / productivity
- Microsoft Word 2016Consumer Software / productivity
- Microsoft SharePoint Enterprise ServerEnterprise Software / collaboration-groupware
- Microsoft Office LTSC 2021Consumer Software / productivity
And 29 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS: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.
- Initial AccessT1190Exploit Public-Facing Applicationmedium confidence
Sources
References in the record
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21716&
- anti-malware.ru/news/2023-03-06-111332/40656&
- qoop.org/publications/cve-2023-21716-rtf-fonttbl.md
And 1 more reference. See all after sign-in
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