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CVE-2021-23758

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

Ajax.NET Professional Ajax.NET Professional

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.

CVSS Score
8.1
High
EPSS — Exploit Probability
83%
Riskier than 100% of all CVEs · checked 2026-10-03
Exploitation
Confirmed in the wild
KEV since 2026-08-26
Remediation
Patch available
Federal deadline 2026-09-09
CISA required action

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. Deadline for federal agencies: 2026-09-09.

NVD entry Vendor patch PoC / advisory CISA KEV

7 articles across 4 outlets · first covered Aug 26, 2026 · latest Aug 28, 2026

Coverage timeline