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5.5

Windows SMB Leaks Sensitive Information

CVE-2021-36972 · published 5 years ago
Summary

A vulnerability in Windows SMB (Server Message Block) allows attackers to access sensitive information, such as file paths and system details. This could potentially be used to launch further attacks or compromise the system. IT teams should update Windows to the latest patches to address this issue.

What to do
  • Update microsoft windows 10 version 1507 to version 10.0.10240.19060 or later.
  • Update microsoft windows 10 version 1607 to version 10.0.14393.4651 or later.
  • Update microsoft windows 10 version 1809 to version 10.0.17763.2183 or later.
  • Update microsoft windows 10 version 1909 to version 10.0.18363.1801 or later.
  • Update microsoft windows 10 version 2004 to version 10.0.19041.1237 or later.
  • Update microsoft windows 10 version 20h2 to version 10.0.19042.1237 or later.
  • Update microsoft windows 10 version 21h1 to version 10.0.19043.1237 or later.
  • Update microsoft windows 8.1 to version 6.3.9600.20120 or later.
  • Update microsoft windows server 2012 to version 6.2.9200.23462 or later.
  • Update microsoft windows server 2012 (server core installation) to version 6.2.9200.23462 or later.
  • Update microsoft windows server 2012 r2 to version 6.3.9600.20120 or later.
  • Update microsoft windows server 2012 r2 (server core installation) to version 6.3.9600.20120 or later.
  • Update microsoft windows server 2016 to version 10.0.14393.4651 or later.
  • Update microsoft windows server 2016 (server core installation) to version 10.0.14393.4651 or later.
  • Update microsoft windows server 2019 to version 10.0.17763.2183 or later.
  • Update microsoft windows server 2019 (server core installation) to version 10.0.17763.2183 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.230 or later.
  • Update microsoft windows server version 2004 to version 10.0.19041.1237 or later.
  • Update microsoft windows server version 20h2 to version 10.0.19042.1237 or later.
Affected software
VendorProductAffected versions
microsoft windows 10 version 1507 < 10.0.10240.19060
microsoft windows 10 version 1607 < 10.0.14393.4651
microsoft windows 10 version 1809 < 10.0.17763.2183
microsoft windows 10 version 1909 < 10.0.18363.1801
microsoft windows 10 version 2004 < 10.0.19041.1237
microsoft windows 10 version 20h2 < 10.0.19042.1237
microsoft windows 10 version 21h1 < 10.0.19043.1237
microsoft windows 8.1 < 6.3.9600.20120
microsoft windows server 2012 < 6.2.9200.23462
microsoft windows server 2012 (server core installation) < 6.2.9200.23462
microsoft windows server 2012 r2 < 6.3.9600.20120
microsoft windows server 2012 r2 (server core installation) < 6.3.9600.20120
microsoft windows server 2016 < 10.0.14393.4651
microsoft windows server 2016 (server core installation) < 10.0.14393.4651
microsoft windows server 2019 < 10.0.17763.2183
microsoft windows server 2019 (server core installation) < 10.0.17763.2183
microsoft windows server 2022 < 10.0.20348.230
microsoft windows server version 2004 < 10.0.19041.1237
microsoft windows server version 20h2 < 10.0.19042.1237
microsoft windows_10 20h2
21h1
1607
1809
1909
2004
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
microsoft windows_8.1 All versions
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:-:*:-:*
microsoft windows_rt_8.1 All versions
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
microsoft windows_server_2012 All versions
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
microsoft windows_server_2016 20h2
2004
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
microsoft windows_server_2019 All versions
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
microsoft windows_server_2022 All versions
cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*
Original advisory text
Windows SMB Information Disclosure Vulnerability
Windows SMB Information Disclosure Vulnerability
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker partial control (estimated)
Severity
5.5 Medium
Exploitation
<1% chance of attack within 30 days
Timeline
Published15 Sep 2021
Updated4 Nov 2026
First seen10 Aug 2026
Sources
CVE-2021-36972 · NVD
CVE-2021-36972 · MITRE
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