CVE-2021-35393

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Realtek Jungle SDK version v2.x up to v3.4.14B provides a 'WiFi Simple Config' server that implements both UPnP and SSDP protocols. The binary is usually named wscd or mini_upnpd and is the successor to miniigd. The server is vulnerable to a stack buffer overflow vulnerability that is present due to unsafe parsing of the UPnP SUBSCRIBE/UNSUBSCRIBE Callback header. Successful exploitation of this vulnerability allows remote unauthenticated attackers to gain arbitrary code execution on the affected device.

Realtek Jungle SDK versiones v2.x hasta v3.4.14B, proporciona un servidor "WiFi Simple Config" que implementa los protocolos UPnP y SSDP. El binario es usualmente llamado wscd o mini_upnpd y es el sucesor de miniigd. El servidor es vulnerable a una vulnerabilidad de desbordamiento del buffer de la pila que está presente debido al análisis no seguro del encabezado UPnP SUBSCRIBE/UNSUBSCRIBE Callback. Una explotación con éxito de esta vulnerabilidad permite a atacantes no autenticados remotos conseguir una ejecución de código arbitrario en el dispositivo afectado.

*Credits: N/A

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

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-23 CVE Reserved
2021-08-16 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-10-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain	2024-08-04

URL	Date	SRC
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en	2021-08-26
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf	2021-08-26

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Realtek Search vendor "Realtek"		Realtek Jungle Sdk Search vendor "Realtek" for product "Realtek Jungle Sdk"				>= 2.0 <= 3.4.14b Search vendor "Realtek" for product "Realtek Jungle Sdk" and version " >= 2.0 <= 3.4.14b"		-		Affected