All vulnerabilities
CVE-2021-23758

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

Ajax.NET Professional Ajax.NET Professional
Open in ThreatlineRecord JSON
CVSS
8.1High
ExploitationExploited in the wildAdded to KEV 26 Aug 2026CISA KEV
Exploit odds (EPSS)82.6%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline9 Sep 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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 KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 3 Dec 2021Exploit code publicMetasploit
  2. 3 Dec 2021, 20:05 UTCPublishedCVE List
  3. 26 Aug 2026Added to CISA KEVCISA KEV

Public exploit code and templates 1

  • Exploit moduleAjaxPro Deserialization Remote Code Execution 3 Dec 2021Metasploit

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

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.

Text from CVE List

Affected versions 1

  • AjaxPro.2affected: all versions before unspecifiedCVE List

References 5