High [CVE-2020-1118] Microsoft Windows Transport Layer Security Denial of Service Vulnerability
This high-severity Microsoft Server advisory covers CVE-2020-1118 affecting Windows Server 2019 (Server Core installation), Windows Server, version 1803 (Server Core Installation), Windows Server, version 1903 (Server Core installation).
Android app · Google Play
Monitor future Microsoft Server CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
A denial of service vulnerability exists in the Windows implementation of Transport Layer Security (TLS) when it improperly handles certain key exchanges. An attacker who successfully exploited the vulnerability could cause a target system to stop responding.
To exploit this vulnerability, a remote unauthenticated attacker could send a specially crafted request to a target system utilizing TLS 1.2 or lower, triggering the system to automatically reboot. The update addresses the vulnerability by changing the way TLS key exchange messages are validated.
Affected products named by the advisory: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server, version 1803 (Server Core Installation); Windows Server, version 1903 (Server Core installation); and 1 more.
Affected products named by the advisory: Windows Server, version 1909 (Server Core installation).
- Windows 10 Version 1709 10.0.0 before publication
- Windows 10 Version 1709 for 32-bit Systems 10.0.0 before publication
- Windows 10 Version 1803 10.0.0 before publication
- Windows 10 Version 1809 10.0.17763.0 before publication
- Windows 10 Version 1809 10.0.0 before publication
- Windows 10 Version 1903 for 32-bit Systems 10.0.0 before publication
- Windows 10 Version 1903 for ARM64-based Systems 10.0.0 before publication
- Windows 10 Version 1903 for x64-based Systems 10.0.0 before publication
- Windows 10 Version 1909 10.0.0 before publication
- Windows Server 2019 10.0.17763.0 before publication
- Windows Server 2019 (Server Core installation) 10.0.17763.0 before publication
- Windows Server, version 1803 (Server Core Installation) 10.0.0 before publication
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- publication
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- The update addresses the vulnerability by changing the way TLS key exchange messages are validated.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.