CVE-2025-27745
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedUse after free in Microsoft Office allows an unauthorized attacker to execute code locally.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA use-after-free vulnerability in Microsoft Office allows an attacker to execute arbitrary code locally by exploiting a memory management error where memory is accessed after being freed. This is a memory corruption flaw that can be triggered by malicious Office documents.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versions= 2016= 2019= 2021= 2024CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Microsoft Office versionOpen Word, go to File > Account > About Word (or similar for Excel/PowerPoint), or check the version in File > Help. Alternatively, locate winword.exe in the Office installation directory (commonly C:\Program Files\Microsoft Office\ or C:\Program Files (x86)\Microsoft Office\) and view its file properties to see the version.Affected if The displayed version is 2016, 2019, 2021, 2024, or any version of Microsoft 365 Apps (these match the affected product list)
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Confirm Office application is presentVerify that any Microsoft Office application (Word, Excel, PowerPoint) is installed and executable on the system. Check for the presence of executable files such as winword.exe, excel.exe, or powerpnt.exe in the standard Office program folders.Affected if One or more Office applications are installed (the vulnerability exists in the Office suite, not in a standalone component)
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Check for recent security updatesOpen any Office app, go to File > Account > Update Options > View Update History, or open Windows Update history and filter for Microsoft Office updates. Look for updates installed around or after the CVE publication date.Affected if No Office security updates have been installed since the CVE disclosure, indicating the vulnerability patch is missing
If Microsoft Office (version 2016, 2019, 2021, 2024, or Microsoft 365 Apps) is installed and no corresponding security updates have been applied, the environment is likely affected by this use-after-free vulnerability.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the latest Microsoft Office security updates to address the vulnerability. Users should avoid opening untrusted Office documents from unknown sources as a defense-in-depth measure.
- Consultation6.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27745 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27745 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data