CVE-2021-32566 Specific sequence of HTTP/2 frames can cause ATS to crash
An attacker can crash the Apache Traffic Server by sending a specific sequence of HTTP/2 frames, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32566?
CVE-2021-32566 is a high-severity denial of service vulnerability in Apache Traffic Server, published on 30 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Input Validation vulnerability in HTTP/2 of Apache Traffic Server allows an attacker to DOS the server. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.
Weakness: CWE-20
Which versions are affected by CVE-2021-32566?
It affects 2 products.
Products include Apache Traffic Server, Debian Debian Linux.
How do I fix CVE-2021-32566?
Upgrade to a fixed version.
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-2021-32566 being exploited?
There is no known exploitation of CVE-2021-32566 in the wild and no public exploit code.
Other vulnerabilities in Apache Traffic Server
Sources
Also known as DEBIAN-CVE-2021-32566, GHSA-8cqh-mhwj-8g3v, UBUNTU-CVE-2021-32566.