# CVE-2021-23758: A Ajax.NET Professional bug is being used in attacks

Status: Being used now (CISA KEV, added 2026-08-26)
Who: 
Do this: 

## Agent prompt (read-only)
Read-only check, change nothing, send nothing anywhere.
Is Ajax.NET Professional Ajax.NET Professional (CVE-2021-23758) installed or running on this machine or in this project?
1. Find every copy and its version (apps, packages, containers, lockfiles).
2. Compare each version against the vendor's fixed version for CVE-2021-23758. Quote the vendor page you used.
3. Report a table: where, version, fixed version, status (exposed / fixed / not installed / unsure).
4. List the exact update steps, but do not run them.

## Official 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.

## Sources
- https://nvd.nist.gov/vuln/detail/CVE-2021-23758
- https://nvd.nist.gov/vuln/detail/CVE-2021-23758

Generated by isitexploited.org from public sources. Verify version numbers against the vendor before acting.