CVE-2025-49832 Asterisk is Vulnerable to Remote DoS and possible RCE Attacks During Memory Allocation
Remote attackers can cause denial of service or potentially execute code in Asterisk via crafted SIP headers when STIR/SHAKEN verification is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-49832?
CVE-2025-49832 is a medium-severity vulnerability in asterisk, published on 1 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2025-49832?
It affects 2 products.
Products include Sangoma Asterisk, Sangoma Certified Asterisk.
How do I fix CVE-2025-49832?
Upgrade to a fixed version.
Is CVE-2025-49832 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-49832 exists.
Other vulnerabilities in asterisk
- CVE-2024-57520 Path traversal in n/a
- CVE-2025-47779 Using malformed From header can forge identity with ";" or NULL in name portion
- CVE-2025-57767 Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request
- CVE-2022-37325 Memory corruption in n/a
- CVE-2025-1131 Asterisk Unsafe Shell Sourcing in safe_asterisk Leads to Local Privilege Escalation
Sources
Also known as DEBIAN-CVE-2025-49832, GHSA-mrq5-74j5-f5cr, UBUNTU-CVE-2025-49832.