Medium severity · published Aug 1, 2025
CVE-2025-49832
Asterisk is Vulnerable to Remote DoS and possible RCE Attacks During Memory Allocation
6.5
CVSS
0.5%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
asterisk · asterisk
< 18.26.3; >= 20.00.0, < 20.15.1; >= 21.00.0, < 21.10.1; >= 22.00.0, < 22.5.1; >= 20.7-cert6, < 20.7-cert7 · source: vendor, NVD
CA
Certified Asterisk · Sangoma
through 18.9; 20.7; 20.7; 20.7; 20.7; 20.7; +3 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-49832
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-49832
Exploit
https://github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr
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