{"@odata.context":"https://api.msrc.microsoft.com/sug/v2.0/sugodata/v2.0/en-US/$metadata#vulnerability/$entity","id":"00000000-0000-0000-0000-000012575ad2","releaseDate":"2021-06-08T07:00:00Z","cveNumber":"CVE-2021-31977","cveTitle":"Windows Hyper-V Denial of Service Vulnerability","releaseNumber":"2021-Jun","vulnType":"Security Vulnerability","latestRevisionDate":"2021-06-08T07:00:00Z","cweList":[],"cweDetailsListForSearch":[],"mitreText":"CVE-2021-31977","mitreUrl":"https://www.cve.org/CVERecord?id=CVE-2021-31977","publiclyDisclosed":"No","exploited":"No","latestSoftwareReleaseId":2,"latestSoftwareRelease":"Exploitation Less Likely","olderSoftwareReleaseId":2,"olderSoftwareRelease":"Exploitation Less Likely","denialOfService":"N/A","tag":"Role: Windows Hyper-V","issuingCna":"Microsoft","issuingCnaId":0,"severityId":100000001,"severity":"Important","impactId":100000001,"impact":"Denial of Service","langCode":"en-US","baseScore":"8.6","temporalScore":"7.5","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C","vectorStringSource":"Microsoft","isMariner":false,"customerActionRequired":true,"customerActionRequiredId":0,"cweDetailsList":[],"articles":[{"articleType":"FAQ","description":"<p><strong>How might an attacker attempt to exploit this vulnerability?</strong></p>\n<p>By sending a specially crafted message to the Hyper-V host virtualization stack, a guest VM could cause a reference count in the host virtualization stack to be leaked. In most circumstances, this would result in a memory leak on the Hyper-V host. If the leaked reference count value were to overflow, reference count hardening built-in to the Hyper-V virtualization stack would cause the host to bugcheck (crash) in a controlled manner, mitigating this issue against exploitation for code execution or privilege elevation.</p>\n","ordinal":10000}],"revisions":[{"cveNumber":"CVE-2021-31977","version":1,"revisionDate":"2021-06-08T07:00:00Z","initialDate":"0001-01-01T00:00:00Z","description":"<p>Information published.</p>\n","unformattedDescription":"Information published.","notificationNeeded":false,"notificationSent":false,"sourceId":"e13b4bb3-4bb4-eb11-a837-000d3a6d35d9"}]}