THREAT OPS › CVEs › CVE-2021-23758
CVE-2021-23758 — Ajax.NET Professional Deserialization of Untrusted Data Vulnerability
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.
Vulnerability details
- Affected productsAjax.NET Professional
- KEV remediation due2026-09-09
Related reporting
- August 2026 CVE Landscaperecordedfuture
- [NVD] CVE-2021-23758 (HIGH 8.1) — 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.nvd
- CISA Adds Six Known Exploited Vulnerabilities to Catalogcisa_advisories
- [CISA KEV] CVE-2021-23758 — Ajax.NET Professional Ajax.NET Professional: Ajax.NET Professional Deserialization of Untrusted Data Vulnerabilitycisa_kev
- UAT-10147: Chinese-speaking adversary integrates agentic AI into post-compromise operationstalos