CVE-2026-21218

EUVD-2026-7347
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
microsoftCNA
7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Base Score
CVSS 3.x
EPSS Score
Percentile: 8%
Affected Products (NVD)
VendorProductVersion
microsoft.net
8.0.0 ≤
𝑥
< 8.0.24
microsoft.net
9.0.0 ≤
𝑥
< 9.0.13
microsoft.net
10.0.0 ≤
𝑥
< 10.0.3
𝑥
= Vulnerable software versions
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
dotnet6
bionic
dne
focal
dne
jammy
deferred
noble
dne
plucky
dne
questing
dne
trusty
dne
xenial
dne
dotnet7
bionic
dne
focal
dne
jammy
ignored
noble
dne
plucky
dne
questing
dne
trusty
dne
xenial
dne
dotnet8
bionic
dne
focal
dne
jammy
Fixed 8.0.124-8.0.24-0ubuntu1~22.04.1
released
noble
Fixed 8.0.124-8.0.24-0ubuntu1~24.04.1
released
questing
Fixed 8.0.124-8.0.24-0ubuntu1~25.10.1
released
trusty
dne
xenial
dne
dotnet9
bionic
dne
focal
dne
jammy
dne
noble
dne
questing
Fixed 9.0.114-9.0.13-0ubuntu1~25.10.1
released
trusty
dne
xenial
dne
dotnet10
bionic
dne
focal
dne
jammy
dne
noble
Fixed 10.0.103-10.0.3-0ubuntu1~24.04.1
released
questing
Fixed 10.0.103-10.0.3-0ubuntu1~25.10.1
released
trusty
dne
xenial
dne