Severity by source
Sources disagree (Low–High)AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Lifecycle Timeline
1DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Word exposes limited local memory contents when a user opens a specially crafted document. Affecting multiple Office product lines including Microsoft 365 Apps for Enterprise, Office LTSC 2021, LTSC 2024, and their Mac counterparts, the vulnerability carries a CVSS score of 3.3 (Low) and is constrained to confidentiality impact only, with no integrity or availability consequences. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access to the target system and active user interaction: the victim must open a specially crafted Word document (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The overall real-world risk is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malicious Word document designed to trigger the heap buffer overflow during parsing and delivers it to a target via email, file share, or removable media. When the target opens the document, the overflow occurs within the Word process heap, potentially leaking adjacent memory contents - which could include fragments of other open documents, credential material, or process memory - back to the attacker if an exfiltration mechanism is also present. … |
| Remediation | The primary remediation is to apply the vendor-released patch via Microsoft Update or the Office update mechanism. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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Microsoft Office Word contains a security decision bypass (CVE-2026-21514, CVSS 7.8) through reliance on untrusted input
Use-after-free vulnerability in Microsoft Office Word that allows local, unauthenticated attackers to execute arbitrary
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Improper input validation in Microsoft Office Outlook allows an authorized attacker to execute code locally.
Microsoft Office Word contains an out-of-bounds read vulnerability that enables local code execution on affected systems
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. [CVSS 8.4 HIGH]
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally. [CVSS 8.4 HIGH]
Local code execution in Microsoft Office Word arises from an untrusted pointer dereference (CWE-822) that can be trigger
Local code execution in Microsoft Office Word is possible when a user opens a maliciously crafted document that triggers
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-35672
GHSA-pjqr-gm8f-m9wv