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CVE-2021-31955
Windows Kernel Information Disclosure Vulnerability
This record: live connection— last retrieved: 7 November 2026 at 13:21.
Vendor
Published
9 June 2021
Last modified
17 June 2026
Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.
Windows Kernel Information Disclosure Vulnerability
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
LOCAL
Privileges required
LOW
User interaction
NONE
Confidentiality
High
Integrity
None
Availability
None
Probability of exploitation within 30 days
81.1%
Percentile
100e
Source: FIRST.org, updated on 6 November 2026.
Apply updates per vendor instructions.
Our own interpretation and context for the source data above.
IACS Radar assessment
Our own interpretation and context for this vulnerability — not an official source.
IACS Radar priority score
Based on CVSS 5.5, EPSS 81.1%, industrial relevance 30/100; raised due to confirmed active exploitation (KEV).
Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.
Conditions for exploitation
Operational impact & energy relevance
Limited impact on availability; the risk lies mainly with confidentiality or integrity of process data.
No strong energy-sector-specific signals recognised; general OT/ICS relevance.
Recommended defensive measures
Industrial relevance score
Classification is provisional; manual verification by an OT security analyst is recommended.
Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 7 November 2026.
IEC 62443 mapping
Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.