CVE-2021-31977: Windows Hyper-V Denial of Service Vulnerability
Modified
Published 08-06-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-31977 is a high (CVSS 8.6) vulnerability in microsoft windows_10. EPSS estimates a 3.18% chance of exploitation in the next 30 days, higher than 87.9% of scored vulnerabilities.
CVSS score
8.6/10
010
High · v3.1 (CVE.org)EPSS score
3.18%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 08-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Windows Hyper-V Denial of Service Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 8.6Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.6HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Medium 5.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
3.18%
Chance of exploitation in the next 30 days
Percentile
88%
Versus all other CVEs
30-day change
No change 0.00 pp
From 3.18% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft13 products
- windows_10na | 20h2 | 21h1 | 1607 | 1809 | 1909 | 2004
- windows 10 version 1507≥ 10.0.0, < 10.0.10240.18967
- windows 10 version 1607≥ 10.0.0, < 10.0.14393.4467
- windows 10 version 1809≥ 10.0.0, < 10.0.17763.1999
- windows 10 version 1909≥ 10.0.0, < 10.0.18363.1621
1 vendor · 13 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31977X Refsource MISCPatchVendor Advisory