Security readout for executives and security teams
PrintNightmare lets a low-privileged attacker abuse Windows Print Spooler to run code as SYSTEM. That can mean full control of an affected Windows machine. Microsoft released updates and specific configuration guidance, but systems with insecure Point and Print settings can remain exposed. Exposure is likely where affected Windows client or server versions run Print Spooler and have missing July 2021-or-later security updates or insecure Point and Print policy/registry settings. The bundle lists many Windows 10, Windows 11, Windows Server, Windows 8.1, and legacy Server versions. Treat this as urgent for any unpatched or misconfigured Windows estate. It is a high-impact SYSTEM-level vulnerability with known exploitation. Priority should be immediate validation of patch coverage and Point and Print configuration, especially on servers and broadly reachable Windows hosts. Mitigation focus: Install the applicable Microsoft security update for each affected Windows version.; Verify NoWarningNoElevationOnInstall is 0 or not defined.; Verify UpdatePromptSettings is 0 or not defined..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Execution behavior lookup
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Open ATT&CK lookupCVE-2021-34527 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
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
CNA and ADP enrichment extracted from CVE v5
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CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34527CVE reference · x_refsource_MISC
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34527CVE reference · government-resource
- https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-detection-scriptCVE reference
- https://www.vicarius.io/vsociety/posts/cve-2021-34527-printnightmare-mitigation-scriptCVE reference
- https://www.kb.cert.org/vuls/id/383432CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.