CVE-2023-35391

MEDIUMNVD 6.26.2—

6.2

ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

CVSS v3: 6.2
EG Score: 6.2(medium)
EPSS: 85.4%
KEV: Not listed

Published

August 8, 2023

Last Modified

November 21, 2024

References (2)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35391
af854a3a-2127-422b-91ae-364da2661108https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35391

Affected Packages

(2 across 1 ecosystem)

NuGet(2)

Package	Vulnerable range	Fixed in	Dependents
Microsoft.AspNetCore.SignalR.Redis	0.0.1-alpha ... 1.0.4 (12 versions)	1.0.40	—
Microsoft.AspNetCore.SignalR.StackExchangeRedis	6.0.0 ... 6.0.9 (20 versions)	6.0.21	—

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2023-353912023-08-08
ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 19:48 UTCEG score recompute
2026-05-24 19:48 UTCVendor advisory
2026-05-24 16:52 UTCepss_batch

Frequently asked(5)

What is CVE-2023-35391?

CVE-2023-35391 is a medium vulnerability published on August 8, 2023. ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

When was CVE-2023-35391 disclosed?

CVE-2023-35391 was first published in the National Vulnerability Database on August 8, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-35391 actively exploited?

CVE-2023-35391 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-35391?

CVE-2023-35391 has a CVSS v3 base score of 6.2 (NVD).

How do I remediate CVE-2023-35391?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-35391, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-35391

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Is Your Infrastructure Affected by CVE-2023-35391?

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