CVE-2021-35465

low-risk
Published 2021-08-23

Certain Arm products before 2021-08-23 do not properly consider the effect of exceptions on a VLLDM instruction. A Non-secure handler may have read or write access to part of a Secure context. This affects Arm Cortex-M33 r0p0 through r1p0, Arm Cortex-M35P r0, Arm Cortex-M55 r0p0 through r1p0, and Arm China STAR-MC1 (in the STAR SE configuration).

Do I need to act?

-
0.05% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.4/10 Low
LOCAL / LOW complexity

Affected Products (4)

Cortex-M33 Firmware
Cortex-M35P Firmware
Cortex-M55 Firmware
China Star-Mc1 Firmware

Affected Vendors

Arm

References (4)

Vendor Advisory https://developer.arm.com/support/arm-security-updates
Vendor Advisory https://developer.arm.com/support/arm-security-updates/vlldm-instruction-securit...
Vendor Advisory https://developer.arm.com/support/arm-security-updates
Vendor Advisory https://developer.arm.com/support/arm-security-updates/vlldm-instruction-securit...
23
/ 100
low-risk
Severity 13/34 · Low
Exploitability 0/34 · Minimal
Exposure 10/34 · Low