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Public proof of conceptFix available

CVE-2025-55315

A public proof of concept exists; no exploitation attested.

  • Published2025-10-14
  • Fixed in10.0.0-rc.2.25502.107 · 9.0.10 · 8.0.21 · 2.3.6
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-10-1417:15CVE publishedNVD
  2. 2026-04-06Exploit-DB entryExploit-DB

Versions per branch

OSV · NVD
ASP.NET Core
BranchAffectedFixed in
10.0≥ 10.0.0-rc.1.25451.107, < 10.0.0-rc.2.25502.10710.0.0-rc.2.25502.107
9.0≥ 9.0.0, < 9.0.109.0.10
8.0≥ 8.0.0, < 8.0.218.0.21
2.3≥ 2.3.0, < 2.3.62.3.6
2.3< 2.3.62.3.6
Microsoft visual studio 2022
BranchAffectedFixed in
17.14≥ 17.14.0, < 17.14.1717.14.17
17.12≥ 17.12.10, < 17.12.1317.12.13
17.10≥ 17.10.0, < 17.10.2017.10.20

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA6 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft ASP.NET Core 2.3
    Affected
    • ≥ 2.3, < 2.3.6fixed in 2.3.6custom
  • Microsoft ASP.NET Core 8.0
    Affected
    • ≥ 8.0, < 8.0.21fixed in 8.0.21custom
  • Microsoft ASP.NET Core 9.0
    Affected
    • ≥ 9.0, < 9.0.10fixed in 9.0.10custom
  • Microsoft Visual Studio 2022 version 17.10
    Affected
    • ≥ 17.10.0, < 17.10.20fixed in 17.10.20custom
  • Microsoft Visual Studio 2022 version 17.12
    Affected
    • ≥ 17.12.0, < 17.12.13fixed in 17.12.13custom
  • Microsoft Visual Studio 2022 version 17.14
    Affected
    • ≥ 17.14.0, < 17.14.17fixed in 17.14.17custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-02-22

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • azure-functions-extension-bundles-4Chainguardall versions · fixed in 4.28.0-r1
  • dotnetRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:9.0.111-1.el8_10and 10 other packages
  • dotnetAlmaLinux:8all versions · fixed in 9.0.111-1.el8_10and 6 other packages
  • dotnet-8Wolfiall versions · fixed in 8.0.121-r0
  • dotnet-8Chainguardall versions · fixed in 8.0.121-r0
  • dotnet-9Wolfiall versions · fixed in 9.0.111-r0
  • dotnet-9Chainguardall versions · fixed in 9.0.111-r0
  • dotnet-bootstrap-8Wolfiall versions · fixed in 8.0.122-r0

72 more package ranges on OSV.dev

Vendor advisories

  • CVE-2025-55315 Red Hat Product Security977 products fixed · 22 known affected

    dotnet: .NET Security Feature Bypass Vulnerability

    aspnetcore-runtime-6.0 as a component of Red Hat Enterprise Linux 9 · aspnetcore-runtime-7.0 as a component of Red Hat Enterprise Linux 9 · aspnetcore-targeting-pack-6.0 as a component of Red Hat Enterprise Linux 9 · +19 more

  • RHSA-2026:9205 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

  • RHSA-2026:9080 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

  • RHSA-2025:23225 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.25.0 Release.

  • RHBA-2025:20993 Red Hat Product Security107 products fixed

    Red Hat Bug Fix Advisory: .NET 10.0 bug fix and enhancement update

  • RHBA-2025:20916 Red Hat Product Security115 products fixed

    Red Hat Bug Fix Advisory: .NET 10.0 bug fix and enhancement update

7 more advisories

Full record on NVD

Fix

  1. Update ASP.NET Core to 10.0.0-rc.2.25502.107 · 9.0.10 · 8.0.21 · 2.3.6
  2. Vendor fix Red Hat Product Security RHSA-2026:9205 · 1 productFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  3. Vendor fix Red Hat Product Security RHSA-2025:23225 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Vendor fix Red Hat Product Security RHBA-2025:20993 · 107 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  5. Workaround from the vendor Red Hat Product Security RHSA-2026:9205 · 29 productsMitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-52492
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Published
2025-10-14
Last Modified
2026-10-18
NVD status
Modified
GitHub Advisory
GHSA-5rrx-jjjq-q2r5

Frequently asked questions

What is CVE-2025-55315?

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.

Is CVE-2025-55315 actively exploited?

A proof-of-concept exploit exists for CVE-2025-55315, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2025-55315?

CVE-2025-55315 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

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