CVE-2025-55315
ASP.NET Security Feature Bypass Vulnerability
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
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.
Public exploit
A reference of the record is tagged as an exploit or proof of concept: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: a proof of concept is public.
Timeline
ID reserved
By microsoft
- 2 months later
· 2 months later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C |
| NVDNVD · Modified | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L |
- EPSS (exploitation in 30 days)
- 67.2% · top 0.7% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.9.
Weakness
Affected products
- affected 2.3 – < 2.3.6
- affected 8.0 – < 8.0.21
- affected 9.0 – < 9.0.10
Microsoft · Microsoft Visual Studio 2022 version 17.10
- affected 17.10.0 – < 17.10.20
Microsoft · Microsoft Visual Studio 2022 version 17.12
- affected 17.12.0 – < 17.12.13
Microsoft · Microsoft Visual Studio 2022 version 17.14
- affected 17.14.0 – < 17.14.17
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-armGHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-arm64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-armGHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-arm64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-musl-x64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.linux-x64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.osx-arm64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.osx-x64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-armGHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-arm64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x64GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.App.Runtime.win-x86GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- NuGetMicrosoft.AspNetCore.Server.Kestrel.CoreGHSA-5rrx-jjjq-q2r5 (opens in a new tab)
References (3)
- ASP.NET Security Feature Bypass Vulnerability (opens in a new tab)vendor-advisorypatch
- https://gist.github.com/N3mes1s/d0897c13ca199e739ecc2b562f466040 (opens in a new tab)exploit
- https://andrewlock.net/understanding-the-worst-dotnet-vulnerability-request-smuggling-and-cve-2025-55315/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-5rrx-jjjq-q2r5 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-55315)Record last updated .