TI-2021-08922 Aliases CVE-2021-27433 GHSA-5r3j-39g2-55xr

ARM mbed-ualloc memory library Integer Overflow or Wraparound

MEDIUM 52CWE-190Published 2022-05-03 · Updated 2025-04-16

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-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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01787 78th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
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

Vendor	Product	Affected versions	Fixed in	Status	Source
Arm	mbed-ualloc memory library	1.3.0	—	No fix listed	CNA

mbed-ualloc memory library VendorArm Affected 1.3.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:arm:mbed_ualloc:1.3.0:::::::*	1.3.0	Vulnerable	Arm

cpe:2.3:a:arm:mbed_ualloc:1.3.0:*:*:*:*:*:*:* Versions 1.3.0 Vulnerable ·Arm

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-27433
2026-10-03 Alias added: GHSA-5r3j-39g2-55xr

References

Patch 1

https://github.com/ARMmbed/mbed-os/pull/14408

Advisory 1

https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

Sources

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