CVE-2025-36854 (GCVE-0-2025-36854)
Vulnerability from cvelistv5 – Published: 2025-09-08 13:53 – Updated: 2025-09-08 14:01
VLAI?
Summary
A vulnerability ( CVE-2024-38229 https://www.cve.org/CVERecord ) exists in EOL ASP.NET when closing an HTTP/3 stream while application code is writing to the response body, a race condition may lead to use-after-free, resulting in Remote Code Execution.
Per CWE-416: Use After Free https://cwe.mitre.org/data/definitions/416.html , Use After Free is when a product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
This issue affects EOL ASP.NET 6.0.0 <= 6.0.36 as represented in this CVE, as well as 8.0.0 <= 8.0.8, 9.0.0-preview.1.24081.5 <= 9.0.0.RC.1 as represented in CVE-2024-38229 https://www.cve.org/CVERecord .
Additionally, if you've deployed self-contained applications https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.
NOTE: This CVE only represents End Of Life (EOL) software components. The vendor, Microsoft, has indicated there will be no future updates nor support provided upon inquiry.
Severity ?
8.1 (High)
CWE
- CWE-416 - Use After Free
Assigner
References
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|---|---|---|---|---|---|---|---|---|
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Impacted products
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\"Microsoft.AspNetCore.App.Runtime.osx-x64\", \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2025-09-03T07:00:00.000Z\", \"references\": [{\"url\": \"https://www.herodevs.com/vulnerability-directory/cve-2024-38229\", \"name\": \".NET and Visual Studio Remote Code Execution Vulnerability\", \"tags\": [\"third-party-advisory\"]}, {\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38229\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"A vulnerability ( CVE-2024-38229 https://www.cve.org/CVERecord ) exists in EOL ASP.NET when closing an HTTP/3 stream while application code is writing to the response body, a race condition may lead to use-after-free, resulting in Remote Code Execution.\\n\\n Per CWE-416: Use After Free https://cwe.mitre.org/data/definitions/416.html , Use After Free is when a product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \\\"belongs\\\" to the code that operates on the new pointer.\\n\\n This issue affects EOL ASP.NET\\u00a06.0.0 \u003c= 6.0.36 as represented in this CVE, as well as\\u00a08.0.0 \u003c= 8.0.8, 9.0.0-preview.1.24081.5 \u003c= 9.0.0.RC.1 as represented in\\u00a0 CVE-2024-38229 https://www.cve.org/CVERecord .\\n\\n Additionally, if you\u0027ve deployed self-contained applications https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd \\u00a0targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\\n\\n NOTE: This CVE only represents End Of Life (EOL) software components. The vendor, Microsoft, has indicated there will be no future updates nor support provided upon inquiry.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eA vulnerability (\u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://www.cve.org/CVERecord?id=CVE-2024-38229\\\"\u003eCVE-2024-38229\u003c/a\u003e) exists in EOL ASP.NET when closing an HTTP/3 stream while application code is writing to the response body, a race condition may lead to use-after-free, resulting in Remote Code Execution.\u003c/p\u003e \u003cp\u003ePer \u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://cwe.mitre.org/data/definitions/416.html\\\"\u003eCWE-416: Use After Free\u003c/a\u003e, Use After Free is when a product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \\\"belongs\\\" to the code that operates on the new pointer.\u003c/p\u003e \u003cp\u003eThis issue affects EOL ASP.NET\u0026nbsp;6.0.0 \u0026lt;= 6.0.36 as represented in this CVE, as well as\u0026nbsp;8.0.0 \u0026lt;= 8.0.8, 9.0.0-preview.1.24081.5 \u0026lt;= 9.0.0.RC.1 as represented in\u0026nbsp;\u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://www.cve.org/CVERecord?id=CVE-2024-38229\\\"\u003eCVE-2024-38229\u003c/a\u003e.\u003c/p\u003e \u003cp\u003eAdditionally, if you\u0027ve deployed \u003ca target=\\\"_blank\\\" rel=\\\"nofollow\\\" href=\\\"https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd\\\"\u003eself-contained applications\u003c/a\u003e\u0026nbsp;targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\u003c/p\u003e \u003cdiv\u003e \u003cdiv\u003e \u003cp\u003eNOTE: This CVE only represents End Of Life (EOL) software components. The vendor, Microsoft, has indicated there will be no future updates nor support provided upon inquiry.\u003c/p\u003e \u003c/div\u003e \u003c/div\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416: Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"36c7be3b-2937-45df-85ea-ca7133ea542c\", \"shortName\": \"HeroDevs\", \"dateUpdated\": \"2025-09-08T13:53:08.619Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-36854\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-09-08T14:01:20.382Z\", \"dateReserved\": \"2025-04-15T23:50:31.198Z\", \"assignerOrgId\": \"36c7be3b-2937-45df-85ea-ca7133ea542c\", \"datePublished\": \"2025-09-08T13:53:08.619Z\", \"assignerShortName\": \"HeroDevs\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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