CVE-2021-31878 Denial of service in n/a
Asterisk PBX suffers a denial of service via a specific re-INVITE sequence after a BYE request, requiring an upgrade to resolve.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-31878?
CVE-2021-31878 is a medium-severity denial of service vulnerability in Digium Asterisk, published on 27 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without SDP must be received after Asterisk has sent a BYE request.
Weakness: CWE-617
Which versions are affected by CVE-2021-31878?
It affects 1 product.
Products include Digium Asterisk.
How do I fix CVE-2021-31878?
No fix has been published for CVE-2021-31878 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-31878 being exploited?
There is no known exploitation of CVE-2021-31878 in the wild and no public exploit code.
Other vulnerabilities in Digium Asterisk
Sources
Also known as GHSA-h6p9-w9r4-7x73, UBUNTU-CVE-2021-31878.