CVE-2021-23758: high-severity vulnerability in AjaxPro.2
Deserialization of Untrusted Data
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
Patch now. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a working public exploit.
Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.
- CISC Gov.br · 01 Sep 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
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.
The ajaxpro.2 package can be tricked into processing malicious data that deserializes into dangerous .NET code, allowing attackers to execute commands on the server.
CWE-502 vulnerability in ajaxpro.2 allows unauthenticated remote code execution through unsafe deserialization of untrusted .NET objects. The attack vector is network-based via crafted serialized payloads; no authentication is required, and successful exploitation results in complete system compromise at the privilege level of the application.