CVE-2021-38311

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. When the negotiated options are already disabled, servers still respond to DONT and WONT requests with WONT or DONT commands, which may lead to infinite acknowledgment loops, denial of service, and excessive CPU consumption.

En Contiki versión 3.0, se presentan posibles bucles de acuse de recibo no terminados en el servicio Telnet. Cuando las opciones negociadas están deshabilitadas, los servidores siguen respondiendo a las peticiones DONT y WONT con comandos WONT o DONT, lo que puede conllevar a bucles de reconocimiento infinitos, denegación de servicio y consumo excesivo de CPU

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-09 CVE Reserved
2021-08-09 CVE Published
2024-04-24 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://github.com/contiki-os/contiki/issues/2685	2024-08-04

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
Contiki-os Search vendor "Contiki-os"		Contiki Search vendor "Contiki-os" for product "Contiki"				3.0 Search vendor "Contiki-os" for product "Contiki" and version "3.0"		-		Affected