SARA / Free Tools / KEV / CVE-2021-23758

CVE-2021-23758 — newly added to CISA KEV

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.

CISA KEV — Actively Exploited

All versions of package ajaxpro

Vendor / Product
— / Ajax.NET Professional / Ajax.NET Professional
Added to KEV
2026-08-26
BOD 22-01 due
—
Ransomware use
Unknown
CVSS / EPSS
9.8 CRITICAL · EPSS 89.10%

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

03Notes & references

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

No structured affected-product list available — see references below for vendor advisories.

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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