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Fencer Vulns
medium 6.2

CVE-2023-35391 json

ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

published 2023-08-08 3 y ago modified 2026-09-08 2 mo ago also BIT-aspnet-core-2023-35391 , BIT-dotnet-2023-35391 , BIT-dotnet-sdk-2023-35391 , EUVD-2023-2314 , GHSA-j8rm-cm55-qqj6

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

ASP.NET Core SignalR and Visual Studio Information Disclosure Vulnerability

Patch / fix

  • nuget Microsoft.AspNetCore.SignalR.StackExchangeRedis 6.0.21, 7.0.10
  • nuget Microsoft.AspNetCore.SignalR.Redis 1.0.40
  • bitnami aspnet-core 2.1.40
  • bitnami dotnet 6.0.21, 7.0.10
  • bitnami dotnet-sdk 6.0.21, 7.0.10
  • Microsoft .NET 6.0 6.0.21
  • Microsoft .NET 7.0 7.0.10
  • Microsoft ASP.NET Core 2.1 2.1.40
  • Microsoft Microsoft Visual Studio 2022 version 17.2 17.2.18
  • Microsoft Microsoft Visual Studio 2022 version 17.4 17.4.10
  • Microsoft Microsoft Visual Studio 2022 version 17.6 17.6.6
  • dotnet6-build Alpine 3.20, Alpine 3.19, Alpine 3.18 6.0.121-r0
  • dotnet7-build Alpine 3.19, Alpine 3.18 7.0.110-r0
  • dotnet6-runtime Alpine 3.20, Alpine 3.19, Alpine 3.18 6.0.21-r0
  • dotnet7-runtime Alpine 3.19, Alpine 3.18 7.0.10-r0

alpine advisories ALPINE-CVE-2023-35391

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-35391 updated cvss 7.1

dotnet: Redis backplane in SignalR listen disclosure information to unexpected group or user

  • Red Hat .NET 6.0 on Red Hat Enterprise Linux rh-dotnet60, rh-dotnet60-build, rh-dotnet60-runtime Red Hat Enterprise Linux 8 dotnet, dotnet6.0, dotnet7.0, dotnet-host, dotnet-sdk-6.0, dotnet-sdk-7.0, +17 more Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet-host, dotnet-sdk-6.0, dotnet-sdk-7.0, dotnet-hostfxr-6.0, +16 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-165-04 updated cvss 6.2

Siemens ST7 ScadaConnect

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.90% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 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
GitHub 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.AspNetCore.SignalR.StackExchangeRedis
>=7.0.0, <7.0.10
>=6.0.0, <6.0.21
7.0.10
6.0.21
nuget Microsoft.AspNetCore.SignalR.Redis
<1.0.40
1.0.40
bitnami aspnet-core
>=2.1.0, <2.1.40
2.1.40
bitnami dotnet
>=6.0.0, <6.0.21
>=7.0.0, <7.0.10
6.0.21
7.0.10
bitnami dotnet-sdk
>=6.0.0, <6.0.21
>=7.0.0, <7.0.10
6.0.21
7.0.10

Affected products

  • Microsoft .NET 6.0
  • Microsoft .NET 7.0
  • Microsoft ASP.NET Core 2.1
  • Microsoft Microsoft Visual Studio 2022 version 17.2
  • Microsoft Microsoft Visual Studio 2022 version 17.4
  • Microsoft Microsoft Visual Studio 2022 version 17.6

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.