Asp.net Core vulnerabilitiesAnd the versions its exploited flaws hit.
Asp.net Core is made by Microsoft. We track 34 published vulnerabilities in it, across 221 versions. 2 of them are on the list of flaws known to be exploited, the newest added on 10 October 2023. If you run Asp.net Core, check your version against the exploited flaws below and patch those first.
The most recent Asp.net Core flaw added to the known-exploited list is CVE-2023-44487, on 10 October 2023. We keep watching the known-exploited list.
Which versions of Asp.net Core do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "6.0.0 to before 6.0.23" means from 6.0.0 up to, but not including, 6.0.23. Find your version, then patch.
- CVE-2023-44487Exploited list, 10 Oct 2023
HTTP/2 Rapid Reset Attack Vulnerability
6.0.0 to before 6.0.237.0.0 to before 7.0.12 - CVE-2023-38180Exploited list, 9 Aug 2023
Microsoft .NET Core and Visual Studio Denial-of-Service Vulnerability
2.1 to before 2.1.40
Which Asp.net Core vulnerabilities are being exploited?
2 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.5HTTP/2 Rapid Reset Attack Vulnerability
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
- 7.5Microsoft .NET Core and Visual Studio Denial-of-Service Vulnerability
Microsoft .NET Core and Visual Studio contain an unspecified vulnerability that allows for denial-of-service (DoS).
Which Asp.net Core flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
- 66%CVE-2025-55315Critical
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.
- 21%CVE-2020-0603High
A remote code execution vulnerability exists in ASP.NET Core software when the software fails to handle objects in memory.An attacker who successfully exploited the vulnerability could run arbitrary code in the...
- 14%
.NET and Visual Studio Denial of Service Vulnerability
- 11%CVE-2018-8171High
A Security Feature Bypass vulnerability exists in ASP.NET when the number of incorrect login attempts is not validated, aka "ASP.NET Security Feature Bypass Vulnerability." This affects ASP.NET, ASP.NET Core 1.1,...
- 10%CVE-2017-8700High
ASP.NET Core 1.0, 1.1, and 2.0 allow an attacker to bypass Cross-origin Resource Sharing (CORS) configurations and retrieve normally restricted content from a web application, aka "ASP.NET Core Information Disclosure...
- 9.6%CVE-2018-0787High
ASP.NET Core 1.0. 1.1, and 2.0 allow an elevation of privilege vulnerability due to how web applications that are created from templates validate web requests, aka "ASP.NET Core Elevation Of Privilege Vulnerability".
- 9.4%CVE-2017-11879High
ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL aka "ASP.NET Core Elevation Of Privilege Vulnerability".
Running Asp.net Core? We'll keep checking.
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1 flaw being exploited affects software Acme tracks
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
- Matched to
- Asp.net Core on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 34 published vulnerabilities listed under the name Asp.net Core, across 221 versions. The most recent Asp.net Core flaw added to the known-exploited list is CVE-2023-44487, on 10 October 2023.
2 are on the list of flaws known to be exploited. The most recently added are CVE-2023-44487 and CVE-2023-38180.
Each flaw names its own versions, usually as ranges. The newest, CVE-2023-44487, affects 6.0.0 to before 6.0.23, 7.0.0 to before 7.0.12. The versions for every exploited flaw are listed on this page.
Create a Precursor Intelligence account and track Asp.net Core. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.