EUVD-2026-73661
GHSA-87wg-6h8j-v8qh
Severity by source
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Local-only vector with high-privilege prerequisite matches 'authorized attacker'; full C/I/A impact from successful SYSTEM escalation via heap corruption.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Heap-based buffer overflow in Winsock allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Winsock networking subsystem enables local privilege escalation to SYSTEM-level on a broad range of Windows client and server releases. An attacker who already holds a high-privileged (but non-SYSTEM) local account can trigger CWE-122 heap corruption through Winsock to achieve full C:H/I:H/A:H impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker hold a local account with high privileges (PR:H) on the target Windows system - such as a member of the local Administrators group who lacks SYSTEM-level access, or a privileged service account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.7 (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) accurately reflects the local, high-privilege prerequisite: the attacker must already operate within the target system at an elevated but sub-SYSTEM level, substantially limiting the attack surface compared to a remote or unauthenticated vector. … 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 Microsoft security update corresponding to the installed Windows version - exact target build versions are listed above under affected products. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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