Denial of service in QEMU

Published: 2023-03-17
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-14394
Exploitation vector Network
Public exploit N/A
Vulnerable software
Client/Desktop applications / Virtualization software

Vendor QEMU

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Infinite loop

EUVDB-ID: #VU73788

Risk: Medium


CVE-ID: CVE-2020-14394

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No


The vulnerability allows an attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring. A privileged user on the guest OS can consume all available system resources and cause denial of service conditions of the QEMU process on the host.


Install updates from vendor's website.

Vulnerable software versions

QEMU: All versions

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?