CVE-2021-23758

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Aug 27, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

Vendor	Product	Versions
n/a	AjaxPro.2	< unspecified

References

http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.htmlExploit, VDB Entry
https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971Third Party Advisory
http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.htmlExploit, VDB Entry
https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971Third Party Advisory
https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758US Government Resource

Timeline

Published: Dec 3, 2021
Last modified: Aug 27, 2026
Added to CISA KEV: Aug 26, 2026
NVD status: Analyzed

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