NULL pointer dereference in Asterisk
CVE-2025-49832
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (36.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000
Affected products
- Asterisk — versions < 18.26.3, >= 20.00.0, < 20.15.1, >= 21.00.0, < 21.10.1
- Sangoma Asterisk
- Sangoma Certified Asterisk — versions 20.7
Weakness classification (CWE)
References
- github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-49832?
- CVE-2025-49832 is a medium-severity vulnerability in Asterisk, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2025-08-01.
- How severe is CVE-2025-49832?
- Medium severity. CVSS v3 base score is 6.5 out of 10.