Deserialization in Ajaxpro.2 Project

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.836 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-23758?
CVE-2021-23758 is a high-severity vulnerability in Ajaxpro.2 Project, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2021-12-03.
How severe is CVE-2021-23758?
High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2021-23758 known to be exploited?
Yes. CVE-2021-23758 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-26), indicating it is being actively exploited. 10 public proof-of-concept repositories are indexed.