CVE-2021-23758
Deserialization of Untrusted Data
- Published
- Dec 3, 2021
- Updated
- Aug 27, 2026
- Assigning CNA
- snyk
- Evidence observed
- Aug 26, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
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.
Sources
1Proof-of-concept exploit for CVE-2021-23758, demonstrating deserialization vulnerability in AjaxPro via ObjectDataProvider gadget chain with ysoserial.net payload generation.
Responsible use
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