// For flags

CVE-2021-27431

ARM CMSIS RTOS2 Integer Overflow or Wraparound

Severity Score

9.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

ARM CMSIS RTOS2 versiones anteriores a 2.1.3, son vulnerables a una envoltura de enteros en la función inosRtxMemoryAlloc (equivalente a malloc local), que puede conllevar a una asignación arbitraria de memoria, resultando en un comportamiento no esperado como un bloqueo o una ejecución de código inyectado

*Credits: David Atch, Omri Ben Bassat, and Tamir Ariel from Microsoft Section 52, and the Azure Defender for IoT research group reported these vulnerabilities to CISA.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-02-19 CVE Reserved
  • 2022-05-03 CVE Published
  • 2023-11-24 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-190: Integer Overflow or Wraparound
CAPEC
References (1)
URL Tag Source
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04 Third Party Advisory
URL Date SRC
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Arm
Search vendor "Arm"
 Cmsis-rtos
Search vendor "Arm" for product "Cmsis-rtos"
 <= 2.1.3
Search vendor "Arm" for product "Cmsis-rtos" and version " <= 2.1.3"
-
Affected