CVE-2025-29820
Published: 08 April 2025
Summary
CVE-2025-29820 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft Office Long Term Servicing Channel. Its CVSS base score is 7.8 (High).
Operationally, ranked in the top 18.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-29820 is a use-after-free vulnerability, tracked under CWE-416, that affects Microsoft Office Word. The flaw carries a CVSS 3.1 score of 7.8 and permits an attacker to execute arbitrary code on an affected system.
An unauthorized attacker can exploit the issue locally when a user opens a specially crafted document, satisfying the CVSS requirements of local attack vector, no privileges required, and user interaction. Successful exploitation grants the attacker high impact on confidentiality, integrity, and availability, resulting in code execution within the context of the current user.
The official Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29820 contains mitigation guidance and patch information. The associated EPSS score has remained flat at 0.0146 with no material increase observed since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-10118
Vulnerability details
Use after free in Microsoft Office Word 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.