EUVD-2026-73877
GHSA-m95p-gfh4-534p
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered malicious document requires no auth (PR:N) but demands user open the file (UI:R); full code execution yields C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft Office Word arises from a heap-based buffer overflow (CWE-122) triggered when a user opens a specially crafted document. The flaw affects a broad swath of Office product lines - Microsoft 365 Apps for Enterprise, Office 2016/2019/LTSC 2021/LTSC 2024 on Windows, and Office for Mac variants - with vendor patches available at specific build thresholds. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to actively open a specially crafted Word document in an unpatched version of Microsoft Office Word (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score is well-calibrated for this class of vulnerability: the attack vector is network-accessible (AV:N), complexity is low (AC:L), no privileges are required (PR:N), and full code-execution impact applies (C:H/I:H/A:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the patches released by Microsoft through Microsoft Update, the Microsoft Update Catalog, or the Microsoft 365 admin center. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Office deployments (Microsoft 365, Office 2016/2019/LTSC 2021/LTSC 2024), assess patch availability from Microsoft security updates, and issue employee communication prohibiting unsolicited Office document opening. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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