CVE-2023-36899
HighExploitedASP.NET Elevation of Privilege Vulnerability
Published Aug 8, 2023 · Updated Aug 10, 2026
Key Facts
Patch immediately- CVE-2023-36899 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting .net Framework (Microsoft), Microsoft .NET Framework 2.0 Service Pack 2, Microsoft .NET Framework 3.5 and 4.6.2 and 7 more products.
- It is exploited in the wild, listed in Industry KEV feed since Mar 31, 2026. No public exploit code is known.
- EPSS estimates a 77% probability of exploitation in the next 30 days.
- Fixed versions are available, including Microsoft .NET Framework 2.0 Service Pack 2 2.0.50727.8974, Microsoft .NET Framework 3.5 and 4.6.2 10.0.10240.20107, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 10.0.14393.6167.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
77%
Higher than 99.5% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2023-36899 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
ASP.NET Elevation of Privilege Vulnerability
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Mar 31, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
17 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| .net FrameworkMicrosoft | 2.0-sp2, 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 | n/a |
| Microsoft .NET Framework 2.0 Service Pack 2 | >= 2.0.0 | 2.0.50727.8974 |
| Microsoft .NET Framework 3.5 and 4.6.2 | >= 4.7.0 | 10.0.10240.20107 |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | >= 3.0.0.0 | 10.0.14393.6167 |
| Microsoft .NET Framework 3.5 AND 4.7.2 | >= 4.7.0 | 4.7.4057.05 |
Patched Releases
Microsoft .NET Framework 2.0 Service Pack 2
2.0.50727.8974
Microsoft .NET Framework 3.5 and 4.6.2
10.0.10240.20107
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2
10.0.14393.6167
Microsoft .NET Framework 3.5 AND 4.7.2
4.7.4057.05
Microsoft .NET Framework 3.5 AND 4.8
4.8.04654.06
Microsoft .NET Framework 3.5 AND 4.8.1
4.8.09176.01
Microsoft .NET Framework 4.6.2
4.7.04057.05
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
4.7.04057.05
Microsoft .NET Framework 4.8
4.8.4654.06
Timeline
Publicly disclosed
Aug 8, 2023
Added to Industry KEV feed
Mar 31, 2026
Last updated
Aug 10, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
FAQ
Common Questions.
ASP.NET Elevation of Privilege Vulnerability
Affected: .net Framework (Microsoft) versions 2.0-sp2, 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1; Microsoft .NET Framework 2.0 Service Pack 2 versions >= 2.0.0; Microsoft .NET Framework 3.5 and 4.6.2 versions >= 4.7.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Mar 31, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Microsoft .NET Framework 2.0 Service Pack 2 2.0.50727.8974, Microsoft .NET Framework 3.5 and 4.6.2 10.0.10240.20107, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 10.0.14393.6167.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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