CVE-2025-53739
Published: 12 August 2025
Summary
CVE-2025-53739 is a high-severity Type Confusion (CWE-843) vulnerability in Microsoft Office Long Term Servicing Channel. Its CVSS base score is 7.8 (High).
Operationally, ranked in the top 22.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2025-53739 is a type confusion vulnerability, tracked as CWE-843, that affects Microsoft Office Excel. The flaw permits an unauthorized attacker to execute arbitrary code on an affected system when a specially crafted file is processed.
An attacker can exploit the issue locally without any privileges by convincing a user to open a malicious Excel document, resulting in full compromise of confidentiality, integrity, and availability on the target host under the CVSS vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Microsoft has published an advisory for CVE-2025-53739 that includes remediation guidance. The associated EPSS score remains low and unchanged at 0.0104 with no observed upward trajectory after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-24292
Vulnerability details
Access of resource using incompatible type ('type confusion') 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
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.