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Regular Expression Denial of Service in System.Text.RegularExpressions

High severity GitHub Reviewed Published Aug 4, 2021 to the GitHub Advisory Database • Updated Feb 21, 2023

Package

nuget System.Text.RegularExpressions (NuGet)

Affected versions

>= 4.3.0, < 4.3.1

Patched versions

4.3.1

Description

A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings, aka '.NET Framework and .NET Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0980, CVE-2019-0981.

References

Published by the National Vulnerability Database May 16, 2019
Reviewed Aug 4, 2021
Published to the GitHub Advisory Database Aug 4, 2021
Last updated Feb 21, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.147%
(51st percentile)

Weaknesses

CVE ID

CVE-2019-0820

GHSA ID

GHSA-cmhx-cq75-c4mj

Source code

No known source code

Credits

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