EUVD-2026-73716
GHSA-8rg6-qv6x-mj29
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AV:N reflects email delivery over the network; PR:N as sending email requires no target-system credentials; UI:R because the victim must open or preview the message; full CIA from arbitrary code execution in user context.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in Microsoft Office Outlook enables remote unauthenticated attackers to execute arbitrary code on the victim's system across multiple current Office product lines. The CVSS 8.8 vector (AV:N/AC:L/PR:N/UI:R) reflects network-accessible exploitation requiring no privilege, with the sole limiting gate being user interaction-likely opening or previewing a crafted message. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target user open or preview a specially crafted email message within a vulnerable version of Microsoft Outlook (any of the five affected product lines listed above). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score with AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H accurately captures the theoretical severity-an attacker who delivers a crafted email needs no credentials and faces low technical complexity, with full CIA impact upon successful exploitation. … 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 Microsoft-released patches immediately via Microsoft Update, Microsoft Update Catalog, or enterprise deployment tools (WSUS, SCCM, Intune). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Outlook deployments and versions in your environment using endpoint detection tools or asset management systems. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
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