EUVD-2026-73020
GHSA-8m28-52gf-hcmq
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Network-vector SMB client flaw; PR:L because attacker must be authorized; UI:R requires victim to connect to malicious server; C:H for memory disclosure with no I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Windows SMB Client allows an authorized attacker to disclose information over a network.
AnalysisAI
Out-of-bounds read in the Windows SMB Client component exposes sensitive in-memory data to network-accessible, low-privilege attackers across a broad range of Windows releases from Server 2012 through Server 2025 and Windows 10/11 in multiple feature versions. An authorized attacker who induces a victim's SMB client to parse a malformed server response triggers a CWE-125 out-of-bounds memory read, potentially leaking high-value in-process data including credentials or tokens. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concrete prerequisites: (1) the attacker must already hold low-privilege network credentials (PR:L - this is not unauthenticated exploitation), and (2) a victim must actively interact with an attacker-controlled SMB endpoint, typically by browsing a UNC path, mounting a malicious share, or following a link that triggers an SMB client connection (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.7 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N) reflects two meaningful constraints that moderate practical exploitability: PR:L requires the attacker to already hold low-privilege authenticated access, and UI:R means a victim must take some explicit action-such as connecting their SMB client to an attacker-controlled share-before the out-of-bounds read is triggered. … 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 your Windows version, available through Windows Update, WSUS, or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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