Occurred Aug 26, 2026, 12:00:00 AM UTC

First published Oct 27, 2026, 8:15:15 PM UTC · Last updated Oct 27, 2026, 8:15:15 PM UTC

CVE-2021-23758: Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

Reported by CISA Known Exploited Vulnerabilities

The source describes a flaw in Ajax.NET Professional that could enable remote code execution through arbitrary .NET classes. It recommends mitigation or discontinuing the product, but provides no further details about affected deployments.

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Why it matters

The source calls for security action but does not specify the scope of affected systems or whether the flaw is being exploited.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 6/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 2/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 3/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

CISA Known Exploited Vulnerabilities CVE-2021-23758: Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

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