Vulnerability in Microsoft Asp.net Core 2.1

CVE-2023-35391

ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

EPSS: 0.026 (85.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C.

Affected products

Microsoft Asp.net Core 2.1 — versions 2.0
Microsoft Visual Studio 2022 Version 17.2 — versions 17.2.0
Microsoft Visual Studio 2022 Version 17.4 — versions 17.4.0
Microsoft Visual Studio 2022 Version 17.6 — versions 17.6.0
Microsoft .Net 6.0 — versions 6.0.0
Microsoft .Net 7.0 — versions 7.0.0

Public proof-of-concept exploits

References

ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability (vendor-advisory)

Frequently asked questions

What is CVE-2023-35391?: CVE-2023-35391 is a medium-severity vulnerability in Microsoft Asp.net Core 2.1. CVSS score: 6.2/10. Published 2023-08-08.
How severe is CVE-2023-35391?: Medium severity. CVSS v3 base score is 6.2 out of 10.
Is CVE-2023-35391 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.