Home/CVE/A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings, aka '.NET F
CVE

CVE-2019-0820

A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings, aka '.NET F

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.

HIGH · CVSS 7.5 EPSS 0.04755
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
▤

Affected Products & Versions

6
microsoft .net coreall versions
microsoft .net frameworkall versions
redhat enterprise linuxall versions
redhat enterprise linux eusall versions
redhat enterprise linux server ausall versions
redhat enterprise linux server tusall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
NuGet System.Text.RegularExpressions HIGH fixed in 4.3.1
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 May 2019 · 07:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

3
msrcCVE-2019-0820Denial of Service
rhsaRHSA-2019:1259Moderate
rhsaRHSA-2019:1236Moderate
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0820PatchVendor Advisory
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