CVE-2026-23666: .NET Framework Denial of Service Vulnerability
Microsoft · Microsoft .NET Framework 3.5
Vendor fix available · Affected: Microsoft .NET Framework 3.5 · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 72% of scored CVEs
DescriptionCVE.org
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
Affected products6
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Microsoft · Microsoft .NET Framework 3.5from 3.5.0 before 2.0.50727.8982 & 3.0.30729.8976
- Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2from 4.7.0 before 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0
- Microsoft · Microsoft .NET Framework 3.5 AND 4.8from 4.8.0 before 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0
- Microsoft · Microsoft .NET Framework 3.5 AND 4.8.1from 4.8.1 before 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0
- Microsoft · Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2from 4.7.0 before 4.8.4801.0
- Microsoft · Microsoft .NET Framework 4.8from 4.8.0 before 4.8.4801.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Microsoft
- Published
- April 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-23666 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.