What is CVE-2022-29223?

CVE-2022-29223 is a high-severity vulnerability in Azure-Rtos Usbx, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2022-05-24.

How severe is CVE-2022-29223?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2022-29223 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Azure-Rtos Usbx

CVE-2022-29223

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack. In versions prior to 6.1.10, an attacker can cause a buffer overflow by providing the Azure RTOS USBX host stack a HUB descriptor with `bNbPorts` set to a value greater than `UX_MAX_TT` which defaults to 8. For a `bNbPorts` value of 255, the implementation of `ux_host_class_hub_descriptor_get` function will modify the contents of `hub` -> `ux_host_class_hub_device` -> `ux_device_hub_tt` array violating the end boundary by 255 - `UX_MAX_TT` items. The USB host stack needs to validate the number of ports reported by the hub, and if the value is larger than UX_MAX_TT, USB stack needs to reject the request. This fix has been included in USBX release 6.1.10.

Vulnerability class: Buffer Overflow

Published 2022-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: +0.000

Affected products

Azure-Rtos Usbx — versions < 6.1.10
Eclipse Threadx Usbx

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

github.com/azure-rtos/usbx/security/advisories/GHSA-2qc5-385m-x862 (Third Party Advisory, Release Notes)
github.com/azure-rtos/usbx/releases/tag/v6.1.10_rel (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2022-29223?: CVE-2022-29223 is a high-severity vulnerability in Azure-Rtos Usbx, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2022-05-24.
How severe is CVE-2022-29223?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2022-29223 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.