CVE Watch27 ago 2026

CVE-2021-23758

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

CVSS

8.1

Alto

EPSS

83.6%

p100

KEV

SÍ

26 ago 2026

Exploit Today

0-100

Publicado: 3 dic 2021 · Última mod.: 27 ago 2026 · CWE-502

EPSS · 30d

83.6%EPSS · 30 días89.1%

2026-08-022026-08-31

Ficha del catálogo KEV

Producto

Ajax.NET Professional / Ajax.NET Professional

Vulnerabilidad

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

Añadido a KEV

26 ago 2026

Remediar antes de

9 sept 2026

Uso conocido en ransomware

Descripción resumida

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.

Acción requerida

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.

Notas

This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2021-23758

Descripción técnica

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.

Referencias oficiales

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