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TI-2021-08924 Aliases CVE-2021-27435GHSA-8g7w-r5wc-r97f

ARM mbed Integer Overflow or Wraparound

Priority HIGH 81CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

ARM mbed product Version 6.3.0 is vulnerable to integer wrap-around in malloc_wrapper function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01859 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Armmbed6.3.0—No fix listedCNA
  • mbed VendorArm Affected 6.3.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:arm:mbed:6.3.0:*:*:*:*:*:*:*6.3.0VulnerableArm
  • cpe:2.3:o:arm:mbed:6.3.0:*:*:*:*:*:*:* Versions 6.3.0 Vulnerable ·Arm

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27435
  2. 2026-10-03 Alias added: GHSA-8g7w-r5wc-r97f

References

Exploit 1

Advisory 1

  • TI-2024-32661 An issue was discovered in MBed OS 6.16.0. CVSS 3.1HIGH 7.5
  • TI-2024-32660 An issue was discovered in MBed OS 6.16.0. CVSS 3.1HIGH 7.5
  • TI-2024-32658 An issue was discovered in MBed OS 6.16.0. CVSS 3.1HIGH 7.5
  • TI-2024-32657 An issue was discovered in MBed OS 6.16.0. CVSS 3.1HIGH 7.5
  • TI-2024-32656 An issue was discovered in MBed OS 6.16.0. CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences