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CVE WatchAug 19, 2026

CVE-2020-1118

A denial of service vulnerability exists in the Windows implementation of Transport Layer Security (TLS) when it improperly handles certain

CVSS

8.6

High

EPSS

15.2%

p97

KEV

—

Exploit Today

29

0-100

Published: May 21, 2020 · Last modified: Aug 19, 2026

EPSS · 30d
14.7%EPSS · 30 days15.2%
2026-09-262026-10-25
Technical description

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.

Official references
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