Search/CVE-2021-42553
● CVE — Medium

CVE-2021-42553

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.

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CVSS v3.1
6.8 MEDIUM
EPSS
1.05%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
EPSS Trend
Aug 16, 2026 → Aug 22, 2026
▲ 0.04pp
1.02% → 1.05% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorPHYSICAL
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Connections
2 relationships
Timeline
disclosure → media coverage
Oct 21, 2022
Disclosure — published as a CVE record. · last revised by NVD May 7, 2025