CVE-2021-4207

Advisory lineage Upstream: 0 Downstream: 14
Modified
Published: 29 Apr 2022, 16:07
Last modified:21 Mar 2025, 18:03

Vulnerability Summary

Overall Risk (default)
medium
43/100
CVSS Score
8.2 HIGH
v3.1 (nvd)
EPSS Score
0.05% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

29 Apr 2022, 16:07
Published
Vulnerability first disclosed
21 Mar 2025, 18:03
Last Modified
Vulnerability information updated

Description

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

CVSS Metrics

  • v3.1•HIGH•Score: 8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.05%• Percentile: 16%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    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.

  • CWE-120•Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

    The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Affected Systems

  • debian•debian_linux

    10.0 | 11.0

  • qemu•qemu

    < 7.0.0

  • redhat•enterprise_linux

    8.0

References (6)