GHSA-74r6-grj9-8rq6: Duplicate Advisory Remote Code Execution Vulnerability

CRITICAL
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CVSS 9.8
CWE-502
Published
Advisory Summary

GHSA-74r6-grj9-8rq6 is a CRITICAL (CVSS 9.8) remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Duplicate Advisory libraries in the NuGet ecosystem. The issue involves remote code execution in ajaxnetprofessional. Remediation is available by upgrading affected packages to version 21.11.29.1.

GHSA-74r6-grj9-8rq6 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-74r6-grj9-8rq6
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Duplicate Advisory
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix GHSA-74r6-grj9-8rq6

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

AjaxNetProfessional fixed: 21.11.29.1 
Upgrade AjaxNetProfessional to 21.11.29.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for AjaxNetProfessional

How to Check if You Are Affected

To determine whether your application is affected by GHSA-74r6-grj9-8rq6, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for AjaxNetProfessional

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 21.11.29.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6r7c-6w96-8pvw. This link is maintained to preserve external references. ## Original Description 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.

GHSA-74r6-grj9-8rq6 Affected Duplicate Advisory Versions

1 component(s)
Fixed Versions:
21.11.29.1
Product / Package Ecosystem Affected Versions Fixed Version
AjaxNetProfessional
nuget/AjaxNetProfessional
NuGet
< 21.11.29.1
21.11.29.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/michaelschwarz/Ajax.NET-Professional/security/advisories/GHSA-6r7c-6w96-8pvw
NVD — GHSA-74r6-grj9-8rq6 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23758
Security Fix Commit FIX COMMIT
https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57
Duplicate Advisory Source Repository REPOSITORY
https://github.com/michaelschwarz/Ajax.NET-Professional
snyk.io/vuln/snyk-dotnet-aj... WEB
https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971
Duplicate Advisory Security Information SECURITY
http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html

Frequently Asked Questions

What is GHSA-74r6-grj9-8rq6?
GHSA-74r6-grj9-8rq6 is a security vulnerability in Duplicate Advisory involving Remote Code Execution in AjaxNetProfessional under CWE-502: Deserialization of Untrusted Data.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to 21.11.29.1 across affected packages: AjaxNetProfessional.
What version fixes GHSA-74r6-grj9-8rq6?
Upgrading to 21.11.29.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is AjaxNetProfessional affected?
Yes, AjaxNetProfessional is affected in releases prior to 21.11.29.1. Upgrade your dependency to 21.11.29.1 or later.
What is the CVSS score of GHSA-74r6-grj9-8rq6?
GHSA-74r6-grj9-8rq6 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with GHSA-74r6-grj9-8rq6?
GHSA-74r6-grj9-8rq6 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check NuGet dependencies for GHSA-74r6-grj9-8rq6?
Run the dependency tree command: 'inspect dependencies for AjaxNetProfessional'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-74r6-grj9-8rq6",
  "modified" : "2026-02-03T17:39:19Z",
  "published" : "2021-12-16T15:27:55Z",
  "withdrawn" : "2026-02-03T17:39:19Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Remote Code Execution in AjaxNetProfessional",
  "details" : "## Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-6r7c-6w96-8pvw. This link is maintained to preserve external references.\n\n## Original Description\nAll 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "AjaxNetProfessional"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.11.29.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 21.11.29"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/michaelschwarz/Ajax.NET-Professional/security/advisories/GHSA-6r7c-6w96-8pvw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23758"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/michaelschwarz/Ajax.NET-Professional"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-12-06T22:06:15Z",
    "nvd_published_at" : "2021-12-03T20:15:00Z"
  }
}