CVE-2021-23758

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.

Scoring

• CVSS: 8.1 (HIGH, 3.1)
• EPSS exploitation probability: Not yet available
• EPSS percentile: Not yet available

CISA KEV status

• Added to KEV: 2026-08-26
• Remediation due date: 2026-09-09
• Known ransomware campaign use: Unknown

Weakness types (CWE)

• CWE-502
• CWE-502

References

• http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html
• https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57
• https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971
• http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html
• https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57
• https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971
• https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758

More from Ajax.NET Professional

• No other tracked CVEs for this vendor yet.