CVE-2021-41145

FreeSWITCH susceptible to Denial of Service via SIP flooding

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. FreeSWITCH prior to version 1.10.7 is susceptible to Denial of Service via SIP flooding. When flooding FreeSWITCH with SIP messages, it was observed that after a number of seconds the process was killed by the operating system due to memory exhaustion. By abusing this vulnerability, an attacker is able to crash any FreeSWITCH instance by flooding it with SIP messages, leading to Denial of Service. The attack does not require authentication and can be carried out over UDP, TCP or TLS. This issue was patched in version 1.10.7.

FreeSWITCH es una pila de telecomunicaciones definida por software que permite la transformación digital de los conmutadores de telecomunicaciones propietarios a una implementación de software que se ejecuta en cualquier hardware básico. FreeSWITCH antes de la versión 1.10.7 es susceptible de denegación de servicio a través de la inundación SIP. Al inundar FreeSWITCH con mensajes SIP, se observó que después de un número de segundos el proceso era matado por el sistema operativo debido al agotamiento de la memoria. Abusando de esta vulnerabilidad, un atacante es capaz de colapsar cualquier instancia de FreeSWITCH inundándola con mensajes SIP, lo que lleva a una denegación de servicio. El ataque no requiere autenticación y puede llevarse a cabo a través de UDP, TCP o TLS. Este problema fue parcheado en la versión 1.10.7

FreeSWITCH versions 1.10.6 and below suffer from a SIP flooding denial of service vulnerability.

*Credits: N/A

CVSS Scores

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

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-09-15 CVE Reserved
2021-10-25 CVE Published
2024-07-10 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-401: Missing Release of Memory after Effective Lifetime

CAPEC

References (2)

URL	Tag	Source
https://github.com/signalwire/freeswitch/releases/tag/v1.10.7	Release Notes

URL	Date	SRC
https://github.com/signalwire/freeswitch/security/advisories/GHSA-jvpq-23v4-gp3m	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
Freeswitch Search vendor "Freeswitch"		Freeswitch Search vendor "Freeswitch" for product "Freeswitch"				< 1.10.7 Search vendor "Freeswitch" for product "Freeswitch" and version " < 1.10.7"		-		Affected