{"uuid": "7eb8f608-12de-4b34-863b-6b1fd7d313cd", "vulnerability": {"vulnId": "CVE-2021-23758", "altId": []}, "gcve": {"origin_uuid": "405284c2-e461-4670-8979-7fd2c9755a60", "object_uuid": "7eb8f608-12de-4b34-863b-6b1fd7d313cd"}, "status": {"exploited": true, "status_reason": "confirmed", "status_updated_at": "2026-08-26T00:00:00+00:00"}, "timestamps": {"asserted_at": "2026-08-26T00:00:00+00:00", "recorded_at": "2026-08-26T18:00:01+00:00", "first_seen_at": "2026-08-26T00:00:00+00:00"}, "scope": {"notes": "Ajax.NET Professional Deserialization of Untrusted Data Vulnerability | Affected: Ajax.NET Professional / Ajax.NET Professional | Description: 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. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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. | Due date: 2026-09-09 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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"}, "evidence": [{"type": "vendor_report", "source": "cisa-kev", "signal": "successful_exploitation", "confidence": 0.8, "details": {"cwes": ["CWE-502"], "feed": "CISA Known Exploited Vulnerabilities Catalog", "product": "Ajax.NET Professional", "due_date": "2026-09-09", "date_added": "2026-08-26", "vendorProject": "Ajax.NET Professional", "vulnerabilityName": "Ajax.NET Professional Deserialization of Untrusted Data Vulnerability", "knownRansomwareCampaignUse": "Unknown"}}], "references": [{"id": "CVE-2021-23758", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-23758"}]}