CVE-2025-29823
Published: 08 April 2025
Summary
CVE-2025-29823 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft 365 Apps. Its CVSS base score is 7.8 (High).
Operationally, ranked in the top 28.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-29823 is a use-after-free vulnerability (CWE-416) in Microsoft Office Excel. The flaw carries a CVSS 3.1 score of 7.8 and permits an attacker to execute arbitrary code on an affected system when the vulnerability is triggered.
An unauthenticated local attacker can exploit the issue without any privileges by convincing a user to open a malicious Excel document. Successful exploitation grants full control over confidentiality, integrity, and availability on the target host.
Microsoft has published guidance and remediation details for the vulnerability in its Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29823. The current EPSS score remains low at 0.0067 with a modest peak of 0.0105.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-10121
Vulnerability details
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.