ASP.NET and Visual Studio
CVE-2023-35391 — ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability
Executive Summary
None
Overview
7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.6
EPSS Score
0.01937
probability of exploitation in the next 30 days
0.77461 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
6 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| .NET 6.0 | 5029688 (Security Update) |
Important | Information Disclosure | Maybe |
| .NET 7.0 | 5029689 (Security Update) |
Important | Information Disclosure | Maybe |
| ASP.NET Core 2.1 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Visual Studio 2022 version 17.2 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Visual Studio 2022 version 17.4 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
| Microsoft Visual Studio 2022 version 17.6 | Release Notes (Security Update) |
Important | Information Disclosure | Maybe |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
5029688 |
Security Update | Maybe |
5029689 |
Security Update | Maybe |
Release Notes |
Security Update | Maybe |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Brennan Conroy
References
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