CVSS 3.1
8.5 highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HCVE-2021-3682
High (8.5). EPSS 2.9% chance of exploitation in the next 30 days.
A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.
Severity
- EPSS
- 2.9% chance of exploitation in the next 30 days; higher than 86% of CVEs (scores of 2026-10-31)
- CWE
- CWE-763
- Published
- Modified
- Record from
- the NVD, synced
Affected
- debian:debian_linux
- qemu:qemu
- redhat:enterprise_linux