Azure RTOS USBx is a USB host, device, and on-the-go (OTG) embedded stack, fully integrated with Azure RTOS ThreadX and available for all Azure RTOS ThreadX–supported processors. Azure RTOS USBX implementation of host support for USB CDC ECM includes an integer underflow and a buffer overflow in the _ux_host_class_cdc_ecm_mac_address_get function which may be potentially exploited to achieve remote code execution or denial of service. Setting mac address string descriptor length to a 0 or 1 allows an attacker to introduce an integer underflow followed (string_length) by a buffer overflow of the cdc_ecm -> ux_host_class_cdc_ecm_node_id array. This may allow one to redirect the code execution flow or introduce a denial of service. The fix has been included in USBX release 6.1.12. Improved mac address string descriptor length validation to check for unexpectedly small values may be used as a workaround.
CVE-2022-36063
This high-severity CVE scores 7.6 under NVD CVSS v3. EPSS exploit probability: 4.2%, top 11% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.6
- EG Score
- 7.6(medium)
- EPSS
- 71.5%
- KEV
- Not listed
Published
October 10, 2022
Last Modified
October 27, 2025
References (6)
- security-advisories@githubhttps://github.com/azure-rtos/usbx/blob/master/common/usbx_host_classes/src/ux_host_class_cdc_ecm_mac_address_get.c#L264
- security-advisories@githubhttps://github.com/azure-rtos/usbx/releases/tag/v6.1.12_rel
- security-advisories@githubhttps://github.com/azure-rtos/usbx/security/advisories/GHSA-chpp-5fv9-6368
- af854a3a-2127-422b-91ae-364da2661108https://github.com/azure-rtos/usbx/blob/master/common/usbx_host_classes/src/ux_host_class_cdc_ecm_mac_address_get.c#L264
- af854a3a-2127-422b-91ae-364da2661108https://github.com/azure-rtos/usbx/releases/tag/v6.1.12_rel
- af854a3a-2127-422b-91ae-364da2661108https://github.com/azure-rtos/usbx/security/advisories/GHSA-chpp-5fv9-6368
Weakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 42× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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- 2026-05-25 14:11 UTCEG score recompute
- 2026-05-24 16:51 UTCEPSS rescore
Related CVEs(same CWE)
Same CWE
10 shownCWE-121
- CVE-2012-10058EG 10.0CRITICAL
- CVE-2010-20113EG 9.8CRITICAL
- CVE-2010-20121EG 9.8CRITICAL
- CVE-2012-10060EG 9.8CRITICAL
- CVE-2012-10023EG 9.8CRITICAL
- CVE-2013-10042EG 9.8CRITICAL
- CVE-2012-10021EG 9.8CRITICAL
- CVE-2014-125117EG 9.8EPSS 91%CRITICAL
- CVE-2014-9189EG 9.8EPSS 92%CRITICAL
- CVE-2014-9163NVD 7.8EG 9.8 KEVEPSS 97%HIGH
Frequently asked(5)
What is CVE-2022-36063?
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