.NET Framework Denial of Service Vulnerability

published 2021-02-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-11027

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 3.8%; EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits: 0; none known

Patch / fix

links 1

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24111 advisory

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-2021-24111 updated 2026-11-07 cvss 7.5

dotnet: remote Denial of Service vulnerability

Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21, rh-dotnet21-runtime Red Hat .NET Core 3.1 on Red Hat Enterprise Linux rh-dotnet31, rh-dotnet31-runtime Red Hat .NET Core 5.0 on Red Hat Enterprise Linux rh-dotnet50, rh-dotnet50-runtime Red Hat Enterprise Linux 8 dotnet, dotnet3.1, dotnet5.0, dotnet-host, dotnet-sdk-2.1, dotnet-sdk-3.1, +21 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

Exploit prediction

3.84% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2
Microsoft Microsoft .NET Framework 4.8
Microsoft Microsoft .NET Framework 4.6
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
Microsoft Microsoft .NET Framework 4.7.2

References

portal.msrc.microsoft.com /en-US/security-guidance/advisory/CVE-2021-24111
patch, vendor-advisory

Sources

CVE List CVE-2021-24111
NVD CVE-2021-24111

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.

Summary