TI-2021-08920 Aliases CVE-2021-27431 GHSA-fphh-2884-975g

ARM CMSIS RTOS2 Integer Overflow or Wraparound

MEDIUM 50CWE-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: Fixed

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

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01148 66th percentileScored 2026-11-07

Fix Fixed CMSIS RTOS2 (ARM): 2.1.3

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	CMSIS RTOS2	before 2.1.3	2.1.3	Patch available	CNA

CMSIS RTOS2 VendorArm Affected before 2.1.3 Fixed in 2.1.3 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:arm:cmsis-rtos::::::::	up to 2.1.3	Vulnerable	Arm

cpe:2.3:o:arm:cmsis-rtos:*:*:*:*:*:*:*:* Versions up to 2.1.3 Vulnerable ·Arm

Remediation

Fix · CNA CMSIS RTOS2 (ARM) Fixed in 2.1.3

Timeline

2026-10-02 Threatist record created from CVE-2021-27431
2026-10-03 Alias added: GHSA-fphh-2884-975g

References

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