CVE-2021-26713 Memory corruption in n/a
An authenticated WebRTC client can crash Asterisk via a stack-based buffer overflow triggered by rapid hold/unhold requests.
- 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-2021-26713?
CVE-2021-26713 is a medium-severity memory corruption vulnerability in Digium Asterisk, published on 19 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.
Weakness: CWE-787
Which versions are affected by CVE-2021-26713?
It affects 2 products.
Products include Digium Asterisk, Digium Certified Asterisk.
How do I fix CVE-2021-26713?
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-2021-26713 being exploited?
There is no known exploitation of CVE-2021-26713 in the wild and no public exploit code.
Other vulnerabilities in Digium Asterisk
Sources
Also known as ALPINE-CVE-2021-26713, GHSA-24f6-gm96-3c56, UBUNTU-CVE-2021-26713.