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CVE-2021-35465

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).

Security Impact Summary

This vulnerability carries a LOW severity rating with a CVSS v3.1 score of 3.4, requiring local system access to exploit with relatively low complexity without requiring user interaction . The vulnerability impacts limited data confidentiality, limited integrity, for affected systems. Impacting 8 products from arm, from arm, from arm and 5 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-08-23T13:15:07.667

Last Modified

2024-11-21T06:12:20.060

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 3.4 (LOW)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:N

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

3.9

Impact Score

4.9

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	arm	cortex-m33_firmware	≤ r1p0	Yes
Hardware	arm	cortex-m33	-	No
Operating System	arm	cortex-m35p_firmware	r0	Yes
Hardware	arm	cortex-m35p	-	No
Operating System	arm	cortex-m55_firmware	≤ r1p0	Yes
Hardware	arm	cortex-m55	-	No
Operating System	arm	china_star-mc1_firmware	-	Yes
Hardware	arm	china_star-mc1	-	No

References

https://developer.arm.com/support/arm-security-updates Vendor Advisory ([email protected])
https://developer.arm.com/support/arm-security-updates/vlldm-instruction-security-vulnerability Vendor Advisory ([email protected])
https://developer.arm.com/support/arm-security-updates Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://developer.arm.com/support/arm-security-updates/vlldm-instruction-security-vulnerability Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For arm's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.