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ReviewHigh

CVE-2020-1108

Microsoft .NET 5.0, .NET Core 2.1, .NET Core 3.1

A denial of service vulnerability exists when .NET Core or .NET Framework improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core or .NET Framework web application. The vulnerability can be exploited remotely, without authentication. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET Core or .NET Framework application. The update addresses the vulnerability by correcting how the .NET Core or .NET Framework web application handles web requests.

CVSS
7.5
EPSS
6.25%
93.1% percentile
CISA KEV
Not listed
Published
2020.05.22
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability6.25%
Technical severityCVSS 7.5

Vulnerability overview

A denial of service vulnerability exists when .NET Core or .NET Framework improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core or .NET Framework web application. The vulnerability can be exploited remotely, without authentication. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET Core or .NET Framework application. The update addresses the vulnerability by correcting how the .NET Core or .NET Framework web application handles web requests.

Affected product and versions

Product
Microsoft .NET 5.0, .NET Core 2.1, .NET Core 3.1
Affected versions
>= 5.0.0 < publication, >= 2.1 < publication, >= 3.1 < publication, >= 2.0.0 < publication, >= 3.0.0 < publication, >= 3.5.0 < publication, >= 3.0.0.0 < publication, >= 3.0 < publication, >= 4.7.0 < publication, >= 4.8.0 < publication, >= 4.0.0.0 < publication, >= 15.9.0 < publication, >= 16.0 < publication, >= 7.0.0 < publication, >= 6.0 < publication, 5.0, >= 2.1 <= 2.1.18, >= 3.0 <= 3.1.4, 2.0, 3.0
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 .NET 5.0, .NET Core 2.1, .NET Core 3.1 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:U/C:N/I:N/A:H
CWE
Not available