Use After Free in Microsoft 365 Apps
CVE-2023-21734
Microsoft Office Remote Code Execution Vulnerability
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Microsoft 365 Apps
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- Microsoft Office 2019 For Mac — versions 16.0.0
- Microsoft Office Ltsc For Mac 2021 — versions 16.0.1
- Microsoft Office — versions 2019
- Microsoft Office Long Term Servicing Channel — versions 2021
Weakness classification (CWE)
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21734 (vendor-advisory)
Frequently asked questions
- What is CVE-2023-21734?
- CVE-2023-21734 is a high-severity vulnerability in Microsoft 365 Apps, classified under Use After Free. CVSS score: 7.8/10. Published 2023-01-10.
- How severe is CVE-2023-21734?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2023-21734 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.