Windows SMB Server
CVE-2019-0703 — Windows SMB Information Disclosure Vulnerability
Executive Summary
An information disclosure vulnerability exists in the way that the Windows SMB Server handles certain requests. An authenticated attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, an attacker would have to be able to authenticate and send SMB messages to an impacted Windows SMB Server The security update addresses the vulnerability by correcting how Windows SMB Server handles authenticated requests.
Overview
6.5
CVSS MEDIUM
Important
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 5.9
EPSS Score
0.0964
probability of exploitation in the next 30 days
0.94873 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
38 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4489872 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 for x64-based Systems | 4489872 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4489882 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4489882 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4489871 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4489871 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4489886 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4489886 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4489886 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4489868 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4489868 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4489868 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4489899 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4489899 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4489899 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 | 4489878 (Monthly Rollup) 4489885 (Security Only) |
Important | Information Disclosure | Yes |
| Windows 7 for x64-based Systems Service Pack 1 | 4489878 (Monthly Rollup) 4489885 (Security Only) |
Important | Information Disclosure | Yes |
| Windows 8.1 for 32-bit systems | 4489881 (Monthly Rollup) 4489883 (Security Only) |
Important | Information Disclosure | Yes |
| Windows 8.1 for x64-based systems | 4489881 (Monthly Rollup) 4489883 (Security Only) |
Important | Information Disclosure | Yes |
| Windows RT 8.1 | 4489881 (Monthly Rollup) |
Important | Information Disclosure | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 4489880 (Monthly Rollup) 4489876 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 4489880 (Monthly Rollup) 4489876 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 for Itanium-Based Systems Service Pack 2 | 4489880 (Monthly Rollup) 4489876 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 4489880 (Monthly Rollup) 4489876 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 4489880 (Monthly Rollup) 4489876 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | 4489878 (Monthly Rollup) 4489885 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4489878 (Monthly Rollup) 4489885 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4489878 (Monthly Rollup) 4489885 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2012 | 4489891 (Monthly Rollup) 4489884 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2012 (Server Core installation) | 4489891 (Monthly Rollup) 4489884 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2012 R2 | 4489881 (Monthly Rollup) 4489883 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2012 R2 (Server Core installation) | 4489881 (Monthly Rollup) 4489883 (Security Only) |
Important | Information Disclosure | Yes |
| Windows Server 2016 | 4489882 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server 2016 (Server Core installation) | 4489882 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server 2019 | 4489899 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server 2019 (Server Core installation) | 4489899 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server, version 1709 (Server Core Installation) | 4489886 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4489868 (Security Update) |
Important | Information Disclosure | Yes |
Patches
11 patches
| Article | Type | Restart |
|---|---|---|
4489872 |
Security Update | Yes |
4489882 |
Security Update | Yes |
4489871 |
Security Update | Yes |
4489886 |
Security Update | Yes |
4489868 |
Security Update | Yes |
4489899 |
Security Update | Yes |
4489878 (Monthly Rollup) 4489885 |
Monthly Rollup | Yes |
4489881 (Monthly Rollup) 4489883 |
Monthly Rollup | Yes |
4489881 |
Monthly Rollup | Yes |
4489880 (Monthly Rollup) 4489876 |
Monthly Rollup | Yes |
4489891 (Monthly Rollup) 4489884 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Symantec, Andrew Burkhardt of MSRC Vulnerabilities & Mitigations Team
References
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