What’s Vulnerable › Vulnerabilities

CVE-2021-27433: ARM mbed-ualloc memory library Integer Overflow or Wraparound

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-03 · updated 2026-06-17
• Weakness: CWE-190

Description

ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Affected products

• ARM mbed-ualloc memory library: 1.3.0

References

• https://github.com/ARMmbed/mbed-os/pull/14408
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
• https://github.com/ARMmbed/mbed-os/pull/14408
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

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