CVE-2021-27431: arm cmsis rtos2 Integer Overflow or Wraparound

Vulnerability summary

CVE-2021-27431 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in arm cmsis rtos2. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.3% of scored vulnerabilities.

Timeline

1. 03-05-2022
   PublishedVulnerability first disclosed.
2. 16-04-2025
   Last modifiedVulnerability information updated.

Description

ARM CMSIS RTOS2 versions prior to 2.1.3 are vulnerable to integer wrap-around inosRtxMemoryAlloc (local malloc equivalent) function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or injected code execution.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.