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.
Actively exploited
- In the CISA exploited-vulnerabilities catalogue since Aug 26, 2026
- US federal agencies must remediate it by Sep 9, 2026 (BOD 22-01)
- First attack observed 1720 days after disclosure
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.
Source: CISA KEV · Sep 8, 2026 Aug 26, 2026 Aug 26, 2026 Aug 20, 2026
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
| Vendors | Product | Versions |
|---|---|---|
| ajaxpro.2 project | ajaxpro.2 | — |
| michaelschwarz | ajax.net professional | < 21.10.30.1 |
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This product uses the NVD API but is not endorsed or certified by the NVD.