JPCERT-AT-2021-0024
JPCERT/CC
2021-05-12
Microsoft Corporation
May 2021 Security Updates
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-May
Microsoft Corporation
Release Notes
https://msrc.microsoft.com/update-guide/releaseNote
At the time of the update's release, these vulnerabilities were not confirmed to have been exploited. As for the HTTP Protocol Stack Remote Code Execution Vulnerability (CVE-2021-31166), which may allow an unauthenticated attacker to execute code by sending a specially crafted packet, Microsoft recommends prioritizing the patching of affected servers.
Microsoft Update Catalog
https://www.catalog.update.microsoft.com/
Windows Update: FAQ
https://support.microsoft.com/en-us/help/12373/windows-update-faq
Microsoft Corporation
Microsoft Security Updates for May 2021 (Monthly) (Japanese)
https://msrc-blog.microsoft.com/2021/05/11/202105-security-updates/
Microsoft Corporation
HTTP Protocol Stack Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/en-us/vulnerability/CVE-2021-31166
If you have any information regarding this alert, please contact JPCERT/CC.
JPCERT Coordination Center (Early Warning Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/
JPCERT/CC
2021-05-12
I. Overview
Microsoft has released May 2021 Security Updates to address the vulnerabilities in their products. Remote attackers leveraging these vulnerabilities may be able to execute arbitrary code. It is recommended to check the information provided by Microsoft and apply the updates.Microsoft Corporation
May 2021 Security Updates
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-May
Microsoft Corporation
Release Notes
https://msrc.microsoft.com/update-guide/releaseNote
At the time of the update's release, these vulnerabilities were not confirmed to have been exploited. As for the HTTP Protocol Stack Remote Code Execution Vulnerability (CVE-2021-31166), which may allow an unauthenticated attacker to execute code by sending a specially crafted packet, Microsoft recommends prioritizing the patching of affected servers.
II. Solution
Please apply the security update programs through Microsoft Update,Windows Update, etc. as soon as possible.Microsoft Update Catalog
https://www.catalog.update.microsoft.com/
Windows Update: FAQ
https://support.microsoft.com/en-us/help/12373/windows-update-faq
III. References
Microsoft Corporation
Microsoft Security Updates for May 2021 (Monthly) (Japanese)
https://msrc-blog.microsoft.com/2021/05/11/202105-security-updates/
Microsoft Corporation
HTTP Protocol Stack Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/en-us/vulnerability/CVE-2021-31166
If you have any information regarding this alert, please contact JPCERT/CC.
JPCERT Coordination Center (Early Warning Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/