MSRXCVE-2021-23758
CVE-2021-23758
Ajax.NET Professional Deserialization of Untrusted Data Vulnerability
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.
CVSS 3.1 · CNA · snyk.io
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
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.
Scores
Affected packages and fixed versions
| Package | Ecosystem | Fixed in |
|---|---|---|
| AjaxNetProfessional | NuGet | 21.11.29.1 |
Affected products
- ajaxpro.2 project ajaxpro.2: all versions
- michaelschwarz ajax.net professional: < 21.10.30.1
Weakness: CWE-502
Also known as: GHSA-6r7c-6w96-8pvw, SNYK-DOTNET-AJAXPRO2-1925971
5 references (advisories, patches, write-ups)
- http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html · Exploit, VDB Entry
- https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57 · Patch, Third Party Advisory
- https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971 · Third Party Advisory
- https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compromise-operations/ · Exploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758 · US Government Resource
Sources: NVD, CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.