Medium severity · published Jun 8, 2021
CVE-2021-31955
Windows Kernel Information Disclosure Vulnerability
In wildKEV
5.5
CVSS
81.1%
EPSS
Yes
On KEV
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)81.1% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueNov 17, 2021
Ransomware campaign useNot known
Affected products
Which versions
WI
Windows · Microsoft
All versions, or not specified · source: KEV
W1
Windows 10 Version 1809 · Microsoft
10.0.0 before 10.0.17763.1999 · source: vendor
W1
Windows 10 Version 1909 · Microsoft
10.0.0 before 10.0.18363.1621 · source: vendor
W1
Windows 10 Version 2004 · Microsoft
10.0.0 before 10.0.19041.1052 · source: vendor
W1
Windows 10 Version 20H2 · Microsoft
10.0.0 before 10.0.19042.1052 · source: vendor
W1
Windows 10 Version 21H1 · Microsoft
10.0.0 before 10.0.19043.1052 · source: vendor
WS
Windows Server 2019 · Microsoft
10.0.0 before 10.0.17763.1999 · source: vendor, NVD
WS
Windows Server 2019 (Server Core installation) · Microsoft
10.0.0 before 10.0.17763.1999 · source: vendor
WS
Windows Server version 2004 · Microsoft
10.0.0 before 10.0.19041.1052 · source: vendor
WS
Windows Server version 20H2 · Microsoft
10.0.0 before 10.0.19042.1052 · source: vendor
W1
Windows 10 1809 · Microsoft
before 10.0.17763.1999 · source: NVD
W1
Windows 10 1909 · Microsoft
before 10.0.18363.1621 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31955
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-31955
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_MISC
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955
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