CVE-2021-23758

Katalog CVE

CVSS 9.8 · Critical KEV · sudah dieksploitasi EPSS 82,6%

Kerentanan Deserialization of Untrusted Data pada ajaxpro.2 project ajaxpro.2, michaelschwarz ajax.net professional. Skor CVSS 3.1 9.8 (Critical) menurut NVD. Masuk katalog KEV CISA pada 26 Agustus 2026, artinya sudah terbukti dieksploitasi.

Deskripsi (NVD)

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.

Advisory KUTIM-CSIRT

• Peringatan Keamanan: Rekapitulasi Kerentanan yang Dieksploitasi Aktif (KEV CISA) Periode 15 Agustus sampai 30 September 2026 30 Sep 2026

Rincian

Terbit di NVD

3 Desember 2021

Terakhir diubah

27 Agustus 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-502: Deserialization of Untrusted Data

EPSS (30 hari)

82,6% peluang dieksploitasi; lebih tinggi dari 99,6% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama

Ajax.NET Professional Deserialization of Untrusted Data Vulnerability

Masuk KEV

26 Agustus 2026

Tenggat CISA

9 September 2026 (untuk instansi federal AS)

Ransomware

Belum tercatat

Tindakan wajib

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.

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/michaelschwarz/Ajax.NET-Professional/commit/b0e63be5f0bb20dfce507cb8a1a9568f6e73de57 patch · advisory pihak ketiga
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-23758 pemerintah AS
• https://snyk.io/vuln/SNYK-DOTNET-AJAXPRO2-1925971 advisory pihak ketiga
• https://blog.talosintelligence.com/uat-10147-chinese-speaking-adversary-integrates-agentic-ai-into-post-compro... exploit · advisory pihak ketiga
• http://packetstormsecurity.com/files/175677/AjaxPro-Deserialization-Remote-Code-Execution.html exploit · vdb entry