## [悪用確認] CVE-2021-23758: Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

- 種別: advisory
- 重大度: critical
- 関連技術: dotnet
- CVE: CVE-2021-23758
- 公開日時: 2026-08-26T00:00:00.000Z
- 情報源: CISA Known Exploited Vulnerabilities (https://nvd.nist.gov/vuln/detail/CVE-2021-23758)
- パーマリンク: https://vulnpulse.app/items/cisa-kev-cve-2021-23758

Ajax.NET Professional Ajax.NET Professional
Ajax.NET Professional (AjaxPro) contains a deserialization of untrusted data vulnerability that could allow for remote code execution via arbitrary .NET classes. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
対応: 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. (期限 2026-09-09)