Buffer overflow - CVE-2020-35776
Published: February 18, 2021 / Updated: February 26, 2021
Vulnerability identifier: #VU50964
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-35776
CWE-ID: CWE-120
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.
Affected software
asterisk (Alpine package)
How to mitigate CVE-2020-35776
Install update from vendor's website.
asterisk (Alpine package) - update to 16.16.1-r0