CVE-2025-49832

Asterisk is Vulnerable to Remote DoS and possible RCE Attacks During Memory Allocation

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

Asterisk is an open source private branch exchange and telephony toolkit. In versions up to and including 18.26.2, between 20.00.0 and 20.15.0, 20.7-cert6, 21.00.0, 22.00.0 through 22.5.0, there is a remote DoS and possible RCE condition in `asterisk/res/res_stir_shaken /verification.c` that can be exploited when an attacker can set an arbitrary Identity header, or STIR/SHAKEN is enabled, with verification set in the SIP profile associated with the endpoint to be attacked. This is fixed in versions 18.26.3, 20.7-cert6, 20.15.1, 21.10.1 and 22.5.1.

Asterisk es un kit de herramientas de telefonía y centralitas privadas de código abierto. En las versiones hasta la 18.26.2 (incluida), entre las 20.00.0 y 20.15.0, 20.7-cert6, 21.00.0 y 22.00.0 a 22.5.0, existe una condición de denegación de servicio (DoS) remota y un posible RCE en `asterisk/res/res_stir_shaken /verification.c` que puede explotarse cuando un atacante puede configurar un encabezado de identidad arbitrario, o si STIR/SHAKEN está habilitado, con la verificación configurada en el perfil SIP asociado al endpoint atacado. Esto se ha corregido en las versiones 18.26.3, 20.7-cert6, 20.15.1, 21.10.1 y 22.5.1.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

Poc

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2025-06-11 CVE Reserved
2025-08-01 CVE Published
2025-08-04 CVE Updated
2025-08-07 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (1)

URL	Tag	Source
https://github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr	X_refsource_confirm

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
Asterisk Search vendor "Asterisk"		Asterisk Search vendor "Asterisk" for product "Asterisk"				< 18.26.3 Search vendor "Asterisk" for product "Asterisk" and version " < 18.26.3"		en		Affected
Asterisk Search vendor "Asterisk"		Asterisk Search vendor "Asterisk" for product "Asterisk"				>= 20.00.0 < 20.15.1 Search vendor "Asterisk" for product "Asterisk" and version " >= 20.00.0 < 20.15.1"		en		Affected
Asterisk Search vendor "Asterisk"		Asterisk Search vendor "Asterisk" for product "Asterisk"				>= 21.00.0 < 21.10.1 Search vendor "Asterisk" for product "Asterisk" and version " >= 21.00.0 < 21.10.1"		en		Affected
Asterisk Search vendor "Asterisk"		Asterisk Search vendor "Asterisk" for product "Asterisk"				>= 22.00.0 < 22.5.1 Search vendor "Asterisk" for product "Asterisk" and version " >= 22.00.0 < 22.5.1"		en		Affected
Asterisk Search vendor "Asterisk"		Asterisk Search vendor "Asterisk" for product "Asterisk"				20.7 Search vendor "Asterisk" for product "Asterisk" and version "20.7"		en		Affected