CVE-2020-1118
highpriority · track · 39EPSS 0.152 · 97 %ileEURUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (38)
Products and version ranges known to be affected.
also known as (4)
Other names and identifiers for this entity.
sources
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references (7)
External citations — patches, advisories, analysis.
- https://nvd.nist.gov/vuln/detail/CVE-2020-1118cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1118cnnvd
- https://portal.msrc.microsoft.com/zh-CN/security-guidance/advisory/CVE-2020-1118cnnvd
- https://vigilance.fr/vulnerability/Microsoft-Windows-vulnerabilities-of-May-2020-32250cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1118enisa_euvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1118nvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1118PatchVendor Advisorynvd
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