CVE-2023-38180 KEV High · 7.5 EPSS 14.1%
Microsoft .NET Core and Visual Studio Denial-of-Service Vulnerability
Microsoft · .NET Core and Visual Studio
Summary
A denial-of-service flaw in Microsoft's .NET Core and Visual Studio, caused by uncontrolled resource consumption. An attacker with network access can trigger it without authentication or user interaction, and the result is a disruption of availability.
Official description · NVD
.NET and Visual Studio Denial of Service Vulnerability
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown. Breakdown
62.6 / 100
- Exploited
- Yes, in CISA KEV
- Reports
- 0
- Tactics
- 2/15
How an attack unfolds
Based on MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. mappings. Select a step to see the evidence.Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
First seen exploited 1 day after disclosure.
- Disclosedday 0
CISA KEV listing is when exploitation was confirmed, not necessarily the first attack.
Patch historyEarlier and later CVEs in the same code, in date order. It shows when a fix was bypassed or incomplete and which version finally fixed it.
See the family tree7 fixes in Microsoft.AspNetCore.App.Runtime.win-x64 over 4 years. The latest fix listed for Microsoft.AspNetCore.App.Runtime.win-x64 is 10.0.8.
Fixes in Microsoft.AspNetCore.App.Runtime.win-x64NuGet package, by fixed version. Earlier and later fixes in the same package, not necessarily the same bug.
- 6.0.8CVE-2022-347169 Aug 2022
- 6.0.9CVE-2022-3801313 Sep 2022
- 7.0.10CVE-2023-381788 Aug 2023
- 7.0.10CVE-2023-381808 Aug 2023KEV
- 8.0.8CVE-2024-3816813 Aug 2024
- 10.0.0-rc.2.25502.107CVE-2025-5531514 Oct 2025
- 10.0.8CVE-2026-4289912 May 2026Latest listed
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
2 TechniqueOne specific attacker behaviour in MITRE ATT&CK, such as T1190 “Exploit Public-Facing Application”. IDs with a dot, like T1059.004, are sub-techniques., grouped by TacticThe attacker’s goal at a stage of an attack in MITRE ATT&CK, such as Initial Access or Persistence. Each technique belongs to one or more tactics. in kill-chain order, 2 cited passages 2Initial AccessTA0001
Exploit Public-Facing Application T1190 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · how it is exploited
Remote unauthenticated network attack on public-facing software
NET and Visual Studio Denial of Service Vulnerability
ImpactTA0040
Endpoint Denial of Service T1499 Medium Confidence (technique links)How sure Patchfirst is that an ATT&CK technique applies to this CVE. High and medium links are shown by default; low ones come from early or generic mappings, text matching, or contradict the CVE’s details.
AI mapping from the description · primary impact
Denial of service causes availability impact
NET and Visual Studio Denial of Service Vulnerability
Detection
0 rules for this CVE · 152 general rules for its techniquesRules for this CVE
0Sigma ruleAn open, vendor-neutral detection rule for log data. Security teams convert Sigma rules into searches for their own SIEM. that reference CVE-2023-38180 directly.CVE-specific rules are not available in this build. Search SigmaHQ ↗
General rules for this CVE’s techniques
These detect the technique in general, not this specific vulnerability.
Exploit Public-Facing ApplicationT1190149 general rules
- Arcadyan Router Exploitationscriticaltest
- Citrix ADS Exploitation CVE-2020-8193 CVE-2020-8195criticaltest
- Citrix Netscaler Attack CVE-2019-19781criticaltest
- Confluence Exploitation CVE-2019-3398criticaltest
- CVE-2010-5278 Exploitation Attemptcriticaltest
- CVE-2020-0688 Exchange Exploitation via Web Logcriticaltest
- CVE-2020-10148 SolarWinds Orion API Auth Bypasscriticaltest
- CVE-2020-5902 F5 BIG-IP Exploitation Attemptcriticaltest
Endpoint Denial of ServiceT14993 general rules
- CVE-2024-49113 Exploitation Attempt - LDAP Nightmarehighexperimental
- LSASS Crash Via Netlogon Stack Buffer Overflow - CVE-2026-41089highexperimental
- Potential Abuse of Linux Magic System Request Keymediumexperimental
Sigma rules © SigmaHQ, Detection Rule License 1.1; linked, not reproduced.
Am I affected? What do I upgrade to?
From GitHub Security Advisories and OSV5 packages in 1 ecosystem. No single main package: each of these ships the affected code.
- NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64Affected: 7.0.0 up to 7.0.10; 6.0.0 up to 6.0.21Upgrade to 7.0.10 or later (older lines: 6.0.21)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x64Affected: 7.0.0 up to 7.0.10; 6.0.0 up to 6.0.21Upgrade to 7.0.10 or later (older lines: 6.0.21)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x86Affected: 7.0.0 up to 7.0.10; 6.0.0 up to 6.0.21Upgrade to 7.0.10 or later (older lines: 6.0.21)
- NuGetMicrosoft.AspNetCore.Server.Kestrel.Transport.LibuvAffected: 6.0.0 up to 6.0.21; All versions before 2.1.40Upgrade to 6.0.21 or later (older lines: 2.1.40)
- NuGetMicrosoft.AspNetCore.Server.Kestrel.Transport.SocketsAffected: All versions before 2.1.40Upgrade to 2.1.40 or later
What security researchers reported
Not named in any threat report yetAlso mentioned in 50 community threat pulses (AlienVault OTX)
Weaker evidencePulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.
- Actively_Exploited_Kev | Oct 29, 202628 Oct 2026
- Actively_Exploited_Kev | Oct 28, 202627 Oct 2026
- Actively_Exploited_Kev | Oct 27, 202626 Oct 2026
- Actively_Exploited_Kev | Oct 24, 202623 Oct 2026
- Actively_Exploited_Kev | Oct 23, 202622 Oct 2026
- Actively_Exploited_Kev | Oct 22, 202621 Oct 2026
- 44 more on OTX