CVE-2021-27433

9.8 criticalEPSS 1.8%

Critical (9.8) in arm mbed ualloc. EPSS 1.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-31)
CWE: CWE-190
Published: 2022-05-03
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

arm:mbed_ualloc

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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