Vulnerability Details : CVE-2021-20181

A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.
Published 2021-05-13 16:15:08
Updated 2022-09-30 15:18:47
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Memory Corruption

Products affected by CVE-2021-20181

Exploit prediction scoring system (EPSS) score for CVE-2021-20181

EPSS FAQ
0.40%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 73 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20181

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.9
 MEDIUM AV:L/AC:M/Au:N/C:C/I:C/A:C
3.4
10.0
 NIST
7.5
 HIGH CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
0.8
6.0
 NIST

CWE ids for CVE-2021-20181

  • The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
    Assigned by: nvd@nist.gov (Primary)
  • The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.
    Assigned by: secalert@redhat.com (Secondary)
  • The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
    Assigned by: secalert@redhat.com (Secondary)

References for CVE-2021-20181

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