CVE-2026-23666
HIGHCVSS 7.5/10EPSS 1.33%
Last modified
CVE-2026-23666 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.. EPSS estimates a 1.33% chance of exploitation in the next 30 days.
Description
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .Net Framework | 3.5 |
| Microsoft | .Net Framework | 4.7.2 |
| Microsoft | .Net Framework | 4.8 |
| Microsoft | .Net Framework | 4.8.1 |
| Microsoft | .Net Framework | 4.6.2 |
| Microsoft | .Net Framework | 4.7 |
| Microsoft | .Net Framework | 4.7.1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-23666?
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
How severe is CVE-2026-23666?
CVE-2026-23666 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.
How do I fix CVE-2026-23666?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-23660Improper access control in Azure Portal Windows Admin Center…7.8
- CVE-2026-23661Cleartext transmission of sensitive information in Azure IoT…7.5
- CVE-2026-23662Missing authentication for critical function in Azure IoT Ex…7.5
- CVE-2026-23663Improper privilege management in Azure Entra ID allows an un…7.5
- CVE-2026-23664Improper restriction of communication channel to intended en…7.5
- CVE-2026-23665Heap-based buffer overflow in Azure Linux Virtual Machines a…7.8
- CVE-2026-23667Use after free in Broadcast DVR allows an authorized attacke…7
- CVE-2026-23668Concurrent execution using shared resource with improper syn…7
- CVE-2026-23669Use after free in RPC Runtime allows an authorized attacker …8.8
- CVE-2026-2367The Secure Copy Content Protection and Content Locking plugi…6.4
- CVE-2026-23670Untrusted pointer dereference in Windows Virtualization-Base…5.7
- CVE-2026-23671Concurrent execution using shared resource with improper syn…7
Are you affected by CVE-2026-23666?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST