CVE-2020-35776 Memory corruption in n/a
Remote attackers can crash Asterisk PBX servers by sending malicious SIP 181 responses, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-35776?
CVE-2020-35776 is a medium-severity memory corruption vulnerability in Digium Asterisk, published on 18 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-120
Which versions are affected by CVE-2020-35776?
It affects 1 product.
Products include Digium Asterisk.
How do I fix CVE-2020-35776?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-35776 being exploited?
There is no known exploitation of CVE-2020-35776 in the wild and no public exploit code.
Other vulnerabilities in Digium Asterisk
Sources
Also known as ALPINE-CVE-2020-35776, DEBIAN-CVE-2020-35776, GHSA-4ch3-ggx2-34pj, UBUNTU-CVE-2020-35776.