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CVE-2021-23758

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

8.1
CVSS
83.6%
EPSS (exploit prob.)
99.7%
EPSS percentile
Yes
Actively exploited
No
Ransomware use
2026-08-26
Added
▼ -5.5 pts
26-day EPSS trend

Summary

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.

Affected software

Vendor: Ajax.NET Professional  ·  Product: Ajax.NET Professional

Weakness types (CWE):

CWE-502

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

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All information is aggregated from public sources for awareness only and does not constitute an accusation or a security assessment. No personal data or credentials are published.