CVE-2021-42553

STM32 USB Host Library Buffer Overflow

View on CVE.org

Published Oct 21, 2022 CVSS 3.1 · 6.8 Medium EPSS 1.3% KEV · Not listed

Description

A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics in versions before 3.5.1 allows an attacker to execute arbitrary code when the descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. The library is typically integrated when using a RTOS such as FreeRTOS on STM32 MCUs.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

STMicroelectronics STM32Cube

STM32 USB Host Library

affected

Version	Status	Constraints
`all`	affected	< 3.5.1

Configuration 1 [-]

cpe:2.3:a:st:stm32_mw_usb_host:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-29521	A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics in versions before 3.5.1 allows an attacker to execute arbitrary code when the descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. The library is typically integrated when using a RTOS such as FreeRTOS on STM32 MCUs.
Ubuntu USN	USN-7472-1	Micropython vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: 1.3% (1.304% probability within 30 days)

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://github.com/STMicroelectronics/stm32_mw_usb_host
https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4

History

Oct 8, 2026 6:30 PM Affected versions updated View changes

Type	Values Removed	Values Added
CPEs	cpe:2.3:a:st:stm32_mw_usb_host:-:::::::*	cpe:2.3:a:st:stm32_mw_usb_host::::::::

Jul 16, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00136}`	epss `{'score': 0.00182}`

May 7, 2025 8:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Subscriptions

St Stm32 Mw Usb Host

Weaknesses

CWE-120

Sources

CVE record Updated: May 7, 2025, 8:10 PM

Status: PUBLISHED
Assigner: NCSC.ch
Published: Oct 21, 2022, 12:00 AM
Updated: May 7, 2025, 8:10 PM
Reserved: Oct 15, 2021, 12:00 AM

View source JSON

Vulnrichment Updated: Aug 4, 2024, 3:38 AM

Updated: Aug 4, 2024, 3:38 AM

NVD Updated: Oct 8, 2026, 6:23 PM

Status: Analyzed
Published: Oct 21, 2022, 10:15 AM
Modified: Oct 8, 2026, 6:23 PM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-42553", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "assignerShortName": "NCSC.ch", "dateUpdated": "2025-05-07T20:10:49.445Z", "dateReserved": "2021-10-15T00:00:00.000Z", "datePublished": "2022-10-21T00:00:00.000Z"}, "containers": {"cna": {"title": "STM32 USB Host Library Buffer Overflow", "providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2023-03-07T00:00:00.000Z"}, "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics in versions before 3.5.1 allows an attacker to execute arbitrary code when the descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. The library is typically integrated when using a RTOS such as FreeRTOS on STM32 MCUs."}], "affected": [{"vendor": "STMicroelectronics STM32Cube ", "product": "STM32 USB Host Library", "versions": [{"version": "all", "status": "affected", "lessThan": "3.5.1", "versionType": "custom"}]}], "references": [{"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4"}, {"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host"}], "credits": [{"lang": "en", "value": "github.com/Defonceuse"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "attackVector": "PHYSICAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "buffer overflow"}]}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "source": {"discovery": "EXTERNAL"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T03:38:49.280Z"}, "title": "CVE Program Container", "references": [{"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4", "tags": ["x_transferred"]}, {"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host", "tags": ["x_transferred"]}]}, {"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-120", "lang": "en", "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-05-07T20:06:01.309946Z", "id": "CVE-2021-42553", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-05-07T20:10:49.445Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4", "tags": ["x_transferred"]}, {"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T03:38:49.280Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-42553", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-05-07T20:06:01.309946Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-120", "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-05-07T20:06:13.169Z"}}], "cna": {"title": "STM32 USB Host Library Buffer Overflow", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "value": "github.com/Defonceuse"}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "PHYSICAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "STMicroelectronics STM32Cube ", "product": "STM32 USB Host Library", "versions": [{"status": "affected", "version": "all", "lessThan": "3.5.1", "versionType": "custom"}]}], "references": [{"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4"}, {"url": "https://github.com/STMicroelectronics/stm32_mw_usb_host"}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics in versions before 3.5.1 allows an attacker to execute arbitrary code when the descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. The library is typically integrated when using a RTOS such as FreeRTOS on STM32 MCUs."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "text", "description": "buffer overflow"}]}], "providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2023-03-07T00:00:00.000Z"}}}, "cveMetadata": {"cveId": "CVE-2021-42553", "state": "PUBLISHED", "dateUpdated": "2025-05-07T20:10:49.445Z", "dateReserved": "2021-10-15T00:00:00.000Z", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "datePublished": "2022-10-21T00:00:00.000Z", "assignerShortName": "NCSC.ch"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "STM32 USB Host Library", "vendor": "STMicroelectronics STM32Cube ", "versions": [{"lessThan": "3.5.1", "status": "affected", "version": "all", "versionType": "custom"}]}], "source": "vulnerability@ncsc.ch"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:st:stm32_mw_usb_host:*:*:*:*:*:*:*:*", "matchCriteriaId": "17DFE5D7-9C93-4ED9-82FB-B6C52A05605F", "versionEndExcluding": "3.5.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics in versions before 3.5.1 allows an attacker to execute arbitrary code when the descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. The library is typically integrated when using a RTOS such as FreeRTOS on STM32 MCUs."}, {"lang": "es", "value": "Una vulnerabilidad de desbordamiento de b\u00fafer en la funci\u00f3n stm32_mw_usb_host de STMicroelectronics permite a un atacante ejecutar c\u00f3digo arbitrario cuando el descriptor contiene m\u00e1s endpoints que USBH_MAX_NUM_ENDPOINTS. La librer\u00eda es integrada normalmente cuando es usado un RTOS como FreeRTOS en los MCUs STM32"}], "id": "CVE-2021-42553", "lastModified": "2026-10-08T18:23:29.090", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "PHYSICAL", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.9, "impactScore": 5.9, "source": "vulnerability@ncsc.ch", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-42553", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-05-07T20:06:01.309946Z", "version": "2.0.3"}}]}, "published": "2022-10-21T10:15:12.470", "references": [{"source": "vulnerability@ncsc.ch", "tags": ["Product"], "url": "https://github.com/STMicroelectronics/stm32_mw_usb_host"}, {"source": "vulnerability@ncsc.ch", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Product"], "url": "https://github.com/STMicroelectronics/stm32_mw_usb_host"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4"}], "sourceIdentifier": "vulnerability@ncsc.ch", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-120"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}