CVE-2021-21281

Buffer overflow due to unvalidated TCP data offset

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Contiki-NG is an open-source, cross-platform operating system for internet of things devices. A buffer overflow vulnerability exists in Contiki-NG versions prior to 4.6. After establishing a TCP socket using the tcp-socket library, it is possible for the remote end to send a packet with a data offset that is unvalidated. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.

Contiki-NG es un sistema operativo de código abierto y multiplataforma para dispositivos del Internet de las cosas. Se presenta una vulnerabilidad de desbordamiento de búfer en las versiones de Contiki-NG anteriores a 4.6. Después de haber establecido un socket TCP usando la biblioteca tcp-socket, es posible para el extremo remoto enviar un paquete con un desplazamiento de datos que no está validado. El problema ha sido parcheado en Contiki-NG versión 4.6. Los usuarios pueden aplicar el parche para esta vulnerabilidad fuera de límite como solución alternativa

*Credits: N/A

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

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

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

2020-12-22 CVE Reserved
2021-06-18 CVE Published
2024-03-03 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/contiki-ng/contiki-ng/pull/1366	2021-06-24
https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mc42-fqfr-h9fp	2021-06-24

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Contiki-ng Search vendor "Contiki-ng"		Contiki-ng Search vendor "Contiki-ng" for product "Contiki-ng"				< 4.6 Search vendor "Contiki-ng" for product "Contiki-ng" and version " < 4.6"		-		Affected