CVE-2019-0820
A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings, aka '.NET Framework and .NET…
- Published
- Updated
- Reserved
- Assigned by
- microsoft
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 5.7% · top 6.9% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- Denial of Service
- CWE-400 (opens in a new tab)All about CWE-400 and its CVEs
Affected products
Microsoft · Microsoft .NET Framework 4.5.2
- affected Windows 7 for 32-bit Systems Service Pack 1
- affected Windows 7 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected Windows Server 2012
- affected Windows Server 2012 (Server Core installation)
- affected Windows 8.1 for 32-bit systems
- affected Windows 8.1 for x64-based systems
- affected Windows Server 2012 R2
- affected Windows RT 8.1
- affected Windows Server 2012 R2 (Server Core installation)
- affected Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft · Microsoft .NET Framework 4.6
- affected Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Windows Server 2008 for x64-based Systems Service Pack 2
- affected 1
- affected 1.1
- affected 2.1
- affected 2.2
Microsoft · Microsoft .NET Framework 4.7.2
- affected Windows 10 Version 1803 for 32-bit Systems
- affected Windows 10 Version 1803 for x64-based Systems
- affected Windows Server, version 1803 (Server Core Installation)
- affected Windows 10 Version 1803 for ARM64-based Systems
- affected Windows Server 2019
- affected Windows Server 2019 (Server Core installation)
Microsoft · Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2
- affected Windows 7 for 32-bit Systems Service Pack 1
- affected Windows 7 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected Windows Server 2012
- affected Windows Server 2012 (Server Core installation)
- affected Windows 8.1 for 32-bit systems
- affected Windows 8.1 for x64-based systems
- affected Windows Server 2012 R2
- affected Windows RT 8.1
- affected Windows Server 2012 R2 (Server Core installation)
Microsoft · Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
- affected Windows Server 2016
- affected Windows Server 2016 (Server Core installation)
Microsoft · Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012 R2
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows RT 8.1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2016
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1703 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1703 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1809 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1809 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2019
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2019 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1903 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1903 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server, version 1903 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5
- affected Windows Server 2012
- affected Windows Server 2012 (Server Core installation)
- affected Windows 8.1 for 32-bit systems
- affected Windows 8.1 for x64-based systems
- affected Windows Server 2012 R2
- affected Windows Server 2012 R2 (Server Core installation)
- affected Windows 10 for 32-bit Systems
- affected Windows 10 for x64-based Systems
- affected Windows Server 2016
- affected Windows 10 Version 1607 for 32-bit Systems
- affected Windows 10 Version 1607 for x64-based Systems
- affected Windows Server 2016 (Server Core installation)
- affected Windows 10 Version 1703 for 32-bit Systems
- affected Windows 10 Version 1703 for x64-based Systems
- affected Windows 10 Version 1709 for 32-bit Systems
- affected Windows 10 Version 1709 for x64-based Systems
- affected Windows 10 Version 1803 for 32-bit Systems
- affected Windows 10 Version 1803 for x64-based Systems
- affected Windows Server, version 1803 (Server Core Installation)
- affected Windows 10 Version 1803 for ARM64-based Systems
- affected Windows 10 Version 1809 for 32-bit Systems
- affected Windows 10 Version 1809 for x64-based Systems
- affected Windows Server 2019
- affected Windows Server 2019 (Server Core installation)
- affected Windows 10 Version 1709 for ARM64-based Systems
Microsoft · Microsoft .NET Framework 3.5 on Windows 10 Version 1903 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 on Windows 10 Version 1903 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 on Windows Server, version 1903 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.0
- affected Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2
- affected Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft · Microsoft .NET Framework 2.0
- affected Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2
- affected Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft · Microsoft .NET Framework 3.5.1
- affected Windows 7 for 32-bit Systems Service Pack 1
- affected Windows 7 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetSystem.Text.RegularExpressionsGHSA-cmhx-cq75-c4mj (opens in a new tab)
References (2)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0820 (opens in a new tab)x_refsource_MISCx_transferred
- RHSA-2019:1259 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-cmhx-cq75-c4mj (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2019-0820)Record last updated .