Cyber Resilience

CVE-2025-47173

Microsoft Office Long Term Servicing Channel 2021 … 2024

Published
10 June 2025
Modified
17 June 2026
CVSS Score v3.1 7.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0054 43th percentile
Risk Priority 58 floored blend · peak EPSS

Summary

CVE-2025-47173 is a high-severity Improper Restriction of Names for Files and Other Resources (CWE-641) vulnerability in Microsoft Office Long Term Servicing Channel. Its CVSS base score is 7.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data from Local System (T1005); ranked at the 43th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Improper input validation in Microsoft Office allows an unauthorized attacker to execute code locally.

CWE(s)
CWE-641

Related Threats

MITRE ATT&CK Enterprise Techniques

T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
T1083 File and Directory Discovery Discovery
Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-47953Same product: Microsoft 365 Apps
CVE-2025-21361Same product: Microsoft Office
CVE-2025-21402Same product: Microsoft Office
CVE-2024-49031Same product: Microsoft 365 Apps
CVE-2024-43609Same product: Microsoft 365 Apps
CVE-2023-35636Same product: Microsoft 365 Apps
CVE-2024-38200Same product: Microsoft 365 Apps
CVE-2023-33149Same product: Microsoft 365 Apps
CVE-2024-38021Same product: Microsoft 365 Apps
CVE-2024-49059Same product: Microsoft 365 Apps

Affected Assets

microsoft
365 apps
all versions
microsoft
office
2016, 2019
microsoft
office long term servicing channel
2021, 2024

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

SI-10 requires validation of inputs used to construct resource names, directly stopping malformed or dangerous names from being accepted.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and sanitization to restrict resource names derived from untrusted data.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect improper filename handling but does not itself prevent the weakness.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and safe resource naming practices that directly prevent CWE-641.

A.8.26 Application security requirements partial match
prevents

Application security requirements include rules for handling untrusted input when constructing file or resource names.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture principles discourage unsafe resource naming but do not prescribe specific controls.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly require validation and sanitization of filenames derived from external input.

References