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CVE-2025-55315

ASP.NET Security Feature Bypass Vulnerability

CVSS 3.1 Critical 9.9

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

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.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 Critical 9.9

Score published by microsoft in the CVE record.

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

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: Low

    A basic user account is needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Changed

    The impact can reach other components beyond the vulnerable one.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: Low

    Limited effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.67162 (67.2% probability)
Percentile
99.3%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA assessment as of Oct 28, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Public proof of concept recorded by CISA
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-444Inconsistent Interpretation of HTTP Requests

Affected products

Products listed in the CVE record, as the CNA published them.

  • Microsoft ASP.NET Core 2.3

    • affected: 2.3 up to before 2.3.6

  • Microsoft ASP.NET Core 8.0

    • affected: 8.0 up to before 8.0.21

  • Microsoft ASP.NET Core 9.0

    • affected: 9.0 up to before 9.0.10

  • Microsoft Visual Studio 2022 version 17.10

    • affected: 17.10.0 up to before 17.10.20

  • Microsoft Visual Studio 2022 version 17.12

    • affected: 17.12.0 up to before 17.12.13

  • Microsoft Visual Studio 2022 version 17.14

    • affected: 17.14.0 up to before 17.14.17

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:52 UTC. Sources and licenses