Security advisory

{
  "id": "b8445c4d2a6fe65dd289bba127288968b5595ea3c8ef3ac4ec94b9fd6302456a",
  "url": "https://osv.dev/vulnerability/CVE-2021-23758",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-23758",
    "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.",
    "evidence": "osv:CVE-2021-23758",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-23758",
      "aliases": [
        "CVE-2021-23758",
        "GHSA-6r7c-6w96-8pvw",
        "SNYK-DOTNET-AJAXPRO2-1925971"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/michaelschwarz/ajax.net-professional",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5955f9eace7bfe3ecba7f27778c4d0b56eb06287"
                },
                {
                  "fixed": "b0e63be5f0bb20dfce507cb8a1a9568f6e73de57"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:michaelschwarz:ajax.net_professional:*:*:*:*:*:.net:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "21.10.30.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b0e63be5f0bb20dfce507cb8a1a9568f6e73de57"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23758.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:38.116988750Z",
      "provider": "osv",
      "references": [
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758",
        "https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971",
        "https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57",
        "https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-23758",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384454,
  "published_at": "2021-12-03T20:15:07.557+00:00"
}