CVE-2021-23758 is a vulnerability in Ajaxpro2project Ajaxpro 2
Published on December 3, 2021
Deserialization of Untrusted Data
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.
Known Exploited Vulnerability
This Ajax.NET Professional Deserialization of Untrusted Data Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. 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.
The following remediation steps are recommended / required by September 9, 2026: 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 applicab
Vulnerability Analysis
CVE-2021-23758 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2021-23758 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2021-23758
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Vulnerable Packages
The following package name and versions may be associated with CVE-2021-23758
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| nuget | AjaxNetProfessional | <= 21.11.29 | 21.11.29.1 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.