CVE-2021-34527

Katalog CVE

CVSS 8.8 · High KEV · sudah dieksploitasi Dipakai ransomware EPSS 99,8%

Kerentanan pada microsoft windows 10 1507, microsoft windows 10 1607 +13 lainnya. Skor CVSS 3.1 8.8 (High) menurut microsoft.com. Masuk katalog KEV CISA pada 3 November 2021, artinya sudah terbukti dieksploitasi. Tercatat dipakai dalam kampanye ransomware.

Deskripsi (NVD)

A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ): HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting) UpdatePromptSettings = 0 (DWORD) or not defined (default setting) Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design. UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates. Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.

Rincian

Terbit di NVD

2 Juli 2021

Terakhir diubah

10 Agustus 2026

Status NVD

Analyzed

CVSS 3.1

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

EPSS (30 hari)

99,8% peluang dieksploitasi; lebih tinggi dari 99,9% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama

Microsoft Windows Print Spooler Remote Code Execution Vulnerability

Masuk KEV

3 November 2021

Tenggat CISA

3 Mei 2022 (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-2021-34527 patch · advisory vendor
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527 mitigasi · patch · advisory vendor
• https://www.kb.cert.org/vuls/id/383432 advisory pihak ketiga · pemerintah AS
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527 pemerintah AS
• http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html exploit · advisory pihak ketiga · vdb entry
• https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-detection-script exploit · advisory pihak ketiga
• https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-mitigation-script exploit · advisory pihak ketiga