CVE-2021-34473

Katalog CVE

CVSS 9.1 · Critical KEV · sudah dieksploitasi Dipakai ransomware EPSS 100,0%

Kerentanan Server-Side Request Forgery (SSRF) pada microsoft exchange server. Skor CVSS 3.1 9.1 (Critical) menurut microsoft.com. Masuk katalog KEV CISA pada 3 November 2021, artinya sudah terbukti dieksploitasi. Tercatat dipakai dalam kampanye ransomware.

Deskripsi (NVD)

Microsoft Exchange Server Remote Code Execution Vulnerability

Rincian

Terbit di NVD

14 Juli 2021

Terakhir diubah

10 Agustus 2026

Status NVD

Analyzed

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-918: Server-Side Request Forgery (SSRF)

EPSS (30 hari)

100,0% peluang dieksploitasi; lebih tinggi dari 99,9% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama

Microsoft Exchange Server Remote Code Execution Vulnerability

Masuk KEV

3 November 2021

Tenggat CISA

17 November 2021 (untuk instansi federal AS)

Ransomware

Tercatat dipakai dalam kampanye ransomware

Tindakan wajib

Apply updates per vendor instructions.

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473 patch · advisory vendor
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473 patch · advisory vendor
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34473 pemerintah AS
• http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html exploit · advisory pihak ketiga · vdb entry
• https://www.zerodayinitiative.com/advisories/ZDI-21-821/ advisory pihak ketiga · vdb entry