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PatchSiren cyber security CVE debrief

CVE-2023-38180 Microsoft CVE debrief

CVE-2023-38180 is a Microsoft .NET Core and Visual Studio denial-of-service vulnerability. CISA listed it in the Known Exploited Vulnerabilities catalog on the same day it was published in the supplied corpus, so it should be treated as a high-priority remediation item.

Vendor
Microsoft
Product
.NET Core and Visual Studio
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-08-09
Original CVE updated
2023-08-09
Advisory published
2023-08-09
Advisory updated
2023-08-09

Who should care

Organizations running Microsoft .NET Core or Visual Studio should pay attention, especially if those components are used on developer workstations, build servers, CI/CD runners, or other shared environments. Teams responsible for patching, endpoint management, and vulnerability response should prioritize this CVE because CISA lists it as known exploited.

Technical summary

The supplied sources identify a denial-of-service vulnerability affecting Microsoft .NET Core and Visual Studio. The corpus does not provide exploit mechanics, affected versions, or a CVSS score. CISA added the CVE to its KEV catalog on 2023-08-09, and the KEV entry directs defenders to apply vendor mitigations or discontinue use if mitigations are unavailable.

Defensive priority

High

Recommended defensive actions

  • Apply Microsoft-recommended mitigations or updates referenced by the vendor advisory.
  • If mitigations are unavailable, reduce exposure or discontinue use of affected installations per CISA guidance.
  • Prioritize remediation for internet-facing, shared, or build-related environments first.
  • Inventory endpoints, build agents, and CI/CD runners for .NET Core and Visual Studio usage.
  • Track the KEV due date of 2023-08-30 and verify remediation is complete before that deadline.

Evidence notes

The supplied corpus shows CVE published and modified on 2023-08-09, and CISA KEV dateAdded is also 2023-08-09 with dueDate 2023-08-30. CISA’s required action in the source item is: apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. The source item notes reference the Microsoft update guide and the NVD entry, but no exploit details or CVSS score are provided in the corpus.

Official resources

CVE published and modified on 2023-08-09. CISA added the CVE to KEV on 2023-08-09 with a remediation due date of 2023-08-30. The supplied corpus lists known ransomware campaign use as Unknown.