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    CVE-2021-23758

    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.

    Published:Dec 3, 2021
    Last Modified:Aug 26, 2026
    EPS:Dec 3, 2021
    EPSS Score:0.89096
    CVSS Score:8.1

    CISA Notification

    Description

    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.

    Required Action:

    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.

    Notes:

    No extra notes provided.

    Due Date
    Sep 9, 2026
    2 days ago
    Alert Date
    Aug 26, 2026
    16 days ago

    Affected Products

    Vendor
    Ajaxpro.2 Project
    Product
    Ajaxpro.2
    Vendor
    Michaelschwarz
    Product
    Ajax.net Professional

    Common Attack Pattern Enumeration and Classification (CAPEC)

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High