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CISA KEV · Known exploitedHigh

CVE-2021-34527

Microsoft Windows

<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 privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p> <p>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 th...

CVSS
8.8
EPSS
99.8%
100.0% percentile
CISA KEV
Listed
Published
2021.07.03
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability99.8%
Technical severityCVSS 8.8

Vulnerability overview

<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 privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.</p> <p>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 th...

Affected product and versions

Product
Microsoft Windows
Affected versions
10.0.0, 6.3.0, 6.0.0, 6.1.0, 6.2.0, < 10.0.10240.18969, < 10.0.14393.4470, < 10.0.17763.2029, < 10.0.19042.1083, < 10.0.19044.1415, < 10.0.19045.2251, < 10.0.22000.318, < 10.0.22621.674, r2, < 10.0.20348.230
Fixed versions
10.0.10240.18969, 10.0.14393.4470, 10.0.17763.2029, 10.0.19042.1083, 10.0.19044.1415, 10.0.19045.2251, 10.0.22000.318, 10.0.22621.674, 10.0.20348.230

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.03
  1. 1
    Identify

    Confirm that Microsoft Windows and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-269
KEV added
2021.11.03
Ransomware use
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