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Priority reviewHigh

CVE-2020-1118

Microsoft Windows 10 Version 1709, Windows 10 Version 1709 for 32-bit Systems, Windows 10 Version 1803

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
8.6
EPSS
16.2%
96.7% percentile
CISA KEV
Not listed
Published
2020.05.22
PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV
Exploit probability16.2%
Technical severityCVSS 8.6

Vulnerability overview

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 product and versions

Product
Microsoft Windows 10 Version 1709, Windows 10 Version 1709 for 32-bit Systems, Windows 10 Version 1803
Affected versions
>= 10.0.0 < publication, >= 10.0.17763.0 < publication, 1709, 1803, 1809, 1903, 1909
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Microsoft Windows 10 Version 1709, Windows 10 Version 1709 for 32-bit Systems, Windows 10 Version 1803 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
Not available