Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

Public source report. This item is not matched to your stack and does not establish whether you are affected.

• NewsExploited · CISA KEVAjax.NET Professional · Ajax.NET Professional

  Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

  CVE-2021-23758

  Ajax.NET Professional (AjaxPro) contains a deserialization of untrusted data vulnerability that could allow for remote code execution via arbitrary .NET classes. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.

  CISA's required action · due 9 Sep 2026 for U.S. federal civilian agencies

  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.

  Cited by CISA: github.com · nvd.nist.gov

  Added to KEV 26 Aug 2026 · Source checked 4 Nov 2026, 16:30 UTC · CISA KEV entry

  Loading voting…