CVE-2021-3682

Advisory lineage Upstream: 0 Downstream: 22
Modified
Published: 05 Aug 2021, 19:51
Last modified:03 Aug 2024, 17:01

Vulnerability Summary

Overall Risk (default)
medium
34/100
CVSS Score
8.5 HIGH
v3.1 (nvd)
EPSS Score
0.48% LOW
0% probability -0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 Aug 2021, 19:51
Published
Vulnerability first disclosed
03 Aug 2024, 17:01
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 8.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 6AV:N/AC:M/Au:S/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.48%• Percentile: 65%

Techniques & Countermeasures

  • CWE-763•Release of Invalid Pointer or Reference

    The product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.

Affected Systems

  • debian•debian_linux

    9.0 | 10.0 | 11.0

  • qemu•qemu

    < 6.1.0 | 6.1.0:rc1

  • redhat•enterprise_linux

    8.0

References (6)