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Fencer Vulns
medium 4.8

CVE-2025-55248 json

.NET, .NET Framework, and Visual Studio Information Disclosure Vulnerability

published 2025-10-14 12 mo ago modified 2026-09-10 1 mo ago also BIT-dotnet-2025-55248 , BIT-dotnet-sdk-2025-55248 , EUVD-2025-34346 , GHSA-gwq6-fmvp-qp68

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

Inadequate encryption strength in .NET, .NET Framework, Visual Studio allows an authorized attacker to disclose information over a network.

Patch / fix

  • nuget Microsoft.NetCore.App.Runtime.linux-arm 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.linux-arm64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-arm 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-arm64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.linux-musl-x64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.linux-x64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.osx-arm64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.osx-x64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.win-arm 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.win-arm64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.win-x64 8.0.21, 9.0.10
  • nuget Microsoft.NetCore.App.Runtime.win-x86 8.0.21, 9.0.10
  • bitnami dotnet 8.0.21, 9.0.10
  • bitnami dotnet-sdk 8.0.21, 9.0.10
  • Microsoft .NET 8.0 8.0.21
  • Microsoft .NET 9.0 9.0.10
  • Microsoft Microsoft .NET Framework 2.0 Service Pack 2 2.0.50727.8981
  • Microsoft Microsoft .NET Framework 3.0 Service Pack 2 2.0.50727.8981
  • Microsoft Microsoft .NET Framework 3.5 2.0.50727.8981
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 4.7.04137.03
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 4.8.04798.02
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1.09320.02
  • Microsoft Microsoft .NET Framework 3.5.1 2.0.50727.8981
  • Microsoft Microsoft .NET Framework 4.6.2 4.7.04137.03
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.04137.03
  • Microsoft Microsoft .NET Framework 4.8 4.8.04798.02
  • Microsoft Microsoft Visual Studio 2022 version 17.10 17.10.20
  • Microsoft Microsoft Visual Studio 2022 version 17.12 17.12.13
  • Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.17
  • dotnet8 Ubuntu 22.04 LTS 8.0.121-8.0.21-0ubuntu1~22.04.1
  • dotnet8 Ubuntu 24.04 LTS 8.0.121-8.0.21-0ubuntu1~24.04.1
  • dotnet8 Ubuntu 25.10 8.0.121-8.0.21-0ubuntu1~25.10.1
  • dotnet9 Ubuntu 25.10 9.0.111-9.0.10-0ubuntu1~25.10.1

ubuntu advisories UBUNTU-CVE-2025-55248

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dotnet9.0 hummingbird 1 9.0.116-1.hum1
  • dotnet8.0 hummingbird 1 8.0.126-1.hum1
  • dotnet9.0 RHEL 10.0 9.0.111-1.el10_0
  • dotnet-host RHEL 10.0 9.0.10-1.el10_0
  • dotnet-sdk-9.0 RHEL 10.0 9.0.111-1.el10_0
  • dotnet-hostfxr-9.0 RHEL 10.0 9.0.10-1.el10_0
  • dotnet-runtime-9.0 RHEL 10.0 9.0.10-1.el10_0
  • dotnet-sdk-aot-9.0 RHEL 10.0 9.0.111-1.el10_0

red hat advisories RHSA-2026:9205RHSA-2026:9080RHSA-2025:18256RHSA-2025:18153RHSA-2025:18152RHSA-2025:18151

  • dotnet-sdk-8.0 AlmaLinux 8 8.0.121-1.el8_10
  • dotnet-hostfxr-8.0 AlmaLinux 8 8.0.21-1.el8_10
  • dotnet-runtime-8.0 AlmaLinux 8 8.0.21-1.el8_10
  • dotnet-sdk-dbg-8.0 AlmaLinux 8 8.0.121-1.el8_10
  • dotnet-templates-8.0 AlmaLinux 8 8.0.121-1.el8_10
  • aspnetcore-runtime-8.0 AlmaLinux 8 8.0.21-1.el8_10
  • dotnet-runtime-dbg-8.0 AlmaLinux 8 8.0.21-1.el8_10
  • dotnet-apphost-pack-8.0 AlmaLinux 8 8.0.21-1.el8_10

almalinux advisories ALSA-2025:18148ALSA-2025:18149ALSA-2025:18150ALSA-2025:18151ALSA-2025:18152ALSA-2025:18153

  • dotnet8.0 Rocky Linux 10 8.0.121-1.el10_0
  • dotnet9.0 Rocky Linux 10 9.0.111-1.el10_0
  • dotnet8.0 Rocky Linux 9 8.0.121-1.el9_6
  • dotnet9.0 Rocky Linux 9 9.0.111-1.el9_6
  • dotnet8.0 Rocky Linux 8 8.0.121-1.el8_10
  • dotnet9.0 Rocky Linux 8 9.0.111-1.el8_10

rocky linux advisories RLSA-2025:18152RLSA-2025:18153RLSA-2025:18149RLSA-2025:18151RLSA-2025:18148RLSA-2025:18150

  • dotnet8-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 8.0.21-r0
  • dotnet9-runtime Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 9.0.10-r0

alpine advisories ALPINE-CVE-2025-55248

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-2025-55248 updated cvss 8.2

dotnet: .NET Information Disclosure Vulnerability

  • Red Hat Enterprise Linux 9 dotnet6.0, dotnet7.0, dotnet-sdk-6.0, dotnet-sdk-7.0, dotnet-hostfxr-6.0, dotnet-hostfxr-7.0, +15 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) dotnet-sdk-8.0-source-built-artifacts 8.0.121-1.el9_4
    fixed: vendor fix RHSA-2025:18256
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 9.0.111-1.el8_10, dotnet8.0 8.0.121-1.el8_10, dotnet9.0 9.0.111-1.el8_10, dotnet-host 9.0.10-1.el8_10, dotnet-sdk-8.0 8.0.121-1.el8_10, dotnet-sdk-9.0 9.0.111-1.el8_10, +22 more
    fixed: vendor fix RHSA-2025:18148
  • Red Hat Enterprise Linux AppStream (v. 9) dotnet8.0 8.0.121-1.el9_6, dotnet9.0 9.0.111-1.el9_6, dotnet-host 9.0.10-1.el9_6, dotnet-sdk-8.0 8.0.121-1.el9_6, dotnet-sdk-9.0 9.0.111-1.el9_6, dotnet-hostfxr-8.0 8.0.21-1.el9_6, +21 more
    fixed: vendor fix RHSA-2025:18149
  • Red Hat Enterprise Linux AppStream (v. 10) dotnet8.0 8.0.121-1.el10_0, dotnet9.0 9.0.111-1.el10_0, dotnet-host 9.0.10-1.el10_0, dotnet-sdk-8.0 8.0.121-1.el10_0, dotnet-sdk-9.0 9.0.111-1.el10_0, dotnet-hostfxr-8.0 8.0.21-1.el10_0, +21 more
    fixed: vendor fix RHSA-2025:18152
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) dotnet8.0 8.0.121-1.el9_4, dotnet-host 8.0.21-1.el9_4, dotnet-sdk-8.0 8.0.121-1.el9_4, dotnet-hostfxr-8.0 8.0.21-1.el9_4, dotnet-runtime-8.0 8.0.21-1.el9_4, dotnet-sdk-dbg-8.0 8.0.121-1.el9_4, +8 more
    fixed: vendor fix RHSA-2025:18256
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) dotnet-sdk-8.0-source-built-artifacts 8.0.121-1.el9_6, dotnet-sdk-9.0-source-built-artifacts 9.0.111-1.el9_6
    fixed: vendor fix RHSA-2025:18149
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) dotnet-sdk-8.0-source-built-artifacts 8.0.121-1.el10_0, dotnet-sdk-9.0-source-built-artifacts 9.0.111-1.el10_0
    fixed: vendor fix RHSA-2025:18152
show 4 more
  • Red Hat Enterprise Linux CRB (v. 8) dotnet-sdk-8.0-source-built-artifacts 8.0.121-1.el8_10, dotnet-sdk-9.0-source-built-artifacts 9.0.111-1.el8_10
    fixed: vendor fix RHSA-2025:18148
  • Red Hat Hardened Images dotnet8.0 8.0.126-1.hum1, dotnet9.0 9.0.116-1.hum1
    fixed: vendor fix RHSA-2026:9080
  • Red Hat OpenShift Dev Spaces (RHOSDS) 3.25 devspaces 3.25.0-1765582207
    fixed: vendor fix RHSA-2025:23225
  • Red Hat Enterprise Linux 9 dotnet10.0, dotnet-host, dotnet-sdk-10.0, dotnet-hostfxr-10.0, dotnet-runtime-10.0, dotnet-sdk-aot-10.0, +9 more Red Hat Enterprise Linux 10 dotnet10.0 Red Hat Hardened Images dotnet10.0, dotnet-sdk-8.0 8.0.126-1.hum1, dotnet-sdk-9.0 9.0.116-1.hum1, dotnet-hostfxr-8.0 8.0.26-1.hum1, dotnet-hostfxr-9.0 9.0.15-1.hum1, dotnet-runtime-8.0 8.0.26-1.hum1, +21 more Red Hat OpenShift Dev Spaces (RHOSDS) 3.25 devspaces 3.25.0-1764891834, devspaces 3.25.0-1764892045, devspaces 3.25.0-1764892466, devspaces 3.25.0-1764892891, devspaces 3.25.0-1765225950, devspaces 3.25.0-1765246979, +9 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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
12 mo ago

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
GitHub 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
NVD 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
OSV 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NetCore.App.Runtime.linux-arm
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.linux-arm64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.linux-musl-arm
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.linux-musl-arm64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.linux-musl-x64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.linux-x64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.osx-arm64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.osx-x64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.win-arm
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.win-arm64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.win-x64
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
nuget Microsoft.NetCore.App.Runtime.win-x86
>=9.0.0, <9.0.10
>=8.0.0, <8.0.21
9.0.10
8.0.21
bitnami dotnet
>=8.0.0, <8.0.21
>=9.0.0, <9.0.10
8.0.21
9.0.10
bitnami dotnet-sdk
>=8.0.0, <8.0.21
>=9.0.0, <9.0.10
8.0.21
9.0.10

Affected products

  • Microsoft .NET 8.0
  • Microsoft .NET 9.0
  • Microsoft Microsoft .NET Framework 2.0 Service Pack 2
  • Microsoft Microsoft .NET Framework 3.0 Service Pack 2
  • Microsoft Microsoft .NET Framework 3.5
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1
  • Microsoft Microsoft .NET Framework 3.5.1
  • Microsoft Microsoft .NET Framework 4.6.2
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 4.8
  • Microsoft Microsoft Visual Studio 2022 version 17.10
  • Microsoft Microsoft Visual Studio 2022 version 17.12
  • Microsoft Microsoft Visual Studio 2022 version 17.14

Classification

Weakness
  • CWE-326 Inadequate Encryption Strength

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.