CVE-2021-27439

TencentOS-tiny Integer Overflow or Wraparound

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

TencentOS-tiny version 3.1.0 is vulnerable to integer wrap-around in function 'tos_mmheap_alloc incorrect calculation of effective memory allocation size. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

TencentOS-tinyv versión 3.1.0, es vulnerable a una envoltura de enteros en el cálculo incorrecto de la función "tos_mmheap_alloc del tamaño efectivo de asignación de memoria. Esta asignación de memoria incorrecta puede conllevar a una asignación de memoria arbitraria, resultando en un comportamiento no esperado como un bloqueo o una inyección/ejecución de código remota

*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
2024-08-03 CVE Updated
2024-10-15 EPSS 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
Tencent Search vendor "Tencent"		Tencentos-tiny Search vendor "Tencent" for product "Tencentos-tiny"				3.1.0 Search vendor "Tencent" for product "Tencentos-tiny" and version "3.1.0"		-		Affected