CVE-2021-23758
Description
All versions of package ajaxpro.2 are vulnerable to Deserialization of Untrusted Data due to the possibility of deserialization of arbitrary .NET classes, which can be abused to gain remote code execution.
How to fix
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date: Sep 9, 2026- michaelschwarz ajax.net_professional21.10.30.1 or later
- AjaxNetProfessional21.11.29.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ajaxpro.2_project ajaxpro.2 | No range specified | — |
| michaelschwarz ajax.net_professional | v < 21.10.30.1 | 21.10.30.1 |
| AjaxNetProfessionalNuGet | v < 21.11.29.1 | 21.11.29.1 |
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Attack Surface Management
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