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CVE-2025-49832

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

Published: Aug 1, 2025Updated: Aug 25, 2025 Sources: CVE List NVDCWE-476
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.4%
Top 66.0%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

asteriskasterisk
On-premWeb App
Communications / voip-telephony
asterisksangoma
On-prem
Communications
certified asterisksangoma
On-prem
Communications / voip-telephony
asteriskoss-projectCommunicationsaka open source, asterisk appliance developer kit
sangomacommercialCACommunicationsaka freepbx, certified asterisk, asterisk

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr
github.com

Timeline

Published
Aug 1, 2025
Last Updated
Aug 25, 2025

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