Vulnerability in Qemu
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.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
EPSS: 0.003 (24.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Qemu
- Debian Debian_linux — versions 9.0, 10.0
- N/a Qemu — versions up to, including 5.2.0
Weakness classification (CWE)
References
- secalert@redhat.com (VDB Entry, Third Party Advisory, x_refsource_MISC)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20181?
- CVE-2021-20181 is a high-severity vulnerability in Qemu, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.5/10. Published 2021-05-13.
- How severe is CVE-2021-20181?
- High severity. CVSS v3 base score is 7.5 out of 10.