PrintNightmare — Microsoft Windows 10 Version 1507 Vulnerability
CVE-2021-34527
<p>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 privilege…
EPSS: 0.942 (99.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C.
Affected products
- Microsoft Windows 10 Version 1507 — versions 10.0.0
- Microsoft Windows 10 Version 1607 — versions 10.0.0
- Microsoft Windows 10 Version 1809 — versions 10.0.0
- Microsoft Windows 10 Version 20h2 — versions 10.0.0
- Microsoft Windows 10 Version 21h2 — versions 10.0.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.0
- Microsoft Windows 11 Version 21h2 — versions 10.0.0
- Microsoft Windows 11 Version 22h2 — versions 10.0.0
- Microsoft Windows 8.1 — versions 6.3.0
- Microsoft Windows Server 2008 R2 Service Pack 1 — versions 6.1.0
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
- byt3bl33d3r/ItWasAllADream
- JohnHammond/CVE-2021-34527
- nemo-wq/PrintNightmare-CVE-2021-34527
- m8sec/CVE-2021-34527
- hackerhouse-opensource/cve-2021-34527
- CnOxx1/CVE-2021-34527-1675
- Tomparte/PrintNightmare
- dywhoami/CVE-2021-34527-Scanner-Based-On-cube0x0-POC
- 0xirison/PrintNightmare-Patcher
- thomas-lauer/PrintNightmare
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527 (x_refsource_MISC)
- packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-34527?
- CVE-2021-34527 is a high-severity vulnerability in Microsoft Windows 10 Version 1507. CVSS score: 8.8/10. Published 2021-07-02.
- How severe is CVE-2021-34527?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-34527 known to be exploited?
- Yes. CVE-2021-34527 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 364 public proof-of-concept repositories are indexed.