CVE-2021-23758

Aliases:GHSA-74r6-grj9-8rq6GHSA-6r7c-6w96-8pvwSNYK-DOTNET-AJAXPRO2-1925971
Analyzed
Published: 03 Dec 2021, 20:05
Last modified:26 Aug 2026, 19:58

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
89.1% CRITICAL
89% probability +2.92%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
3 found
Dark Web
Not detected

Timeline

03 Dec 2021, 20:05
Published
Vulnerability first disclosed
26 Aug 2026, 00:00
Added to CISA KEV
Ajax.NET Professional Deserialization of Untrusted Data Vulnerability
26 Aug 2026, 19:58
Last Modified
Vulnerability information updated
09 Sept 2026, 00:00
CISA Remediation Due
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.

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.

CVSS Metrics

  • v3.1•HIGH•Score: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 89.10%• Percentile: 100%

Techniques & Countermeasures

  • CWE-502•Deserialization of Untrusted Data

    The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Systems

  • ajaxpro.2_project•ajaxpro.2

    < 21.10.30.1

  • michaelschwarz•ajax.net_professional

    < 21.10.30.1

  • NuGet•AjaxNetProfessional

    < 21.11.29.1

References (9)