CVE-2017-9789 Use after free in Apache HTTP Server
An attacker can cause erratic behavior and potential denial of service in Apache HTTP Server by triggering a use-after-free condition during high connection load.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-9789?
CVE-2017-9789 is a high-severity use after free vulnerability in Apache Http Server, published on 13 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.
Weakness: CWE-416
Which versions are affected by CVE-2017-9789?
It affects 1 product.
Products include Apache Http Server.
How do I fix CVE-2017-9789?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2017-9789 being exploited?
There is no known exploitation of CVE-2017-9789 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2017-9789, GHSA-p7q7-pxmj-xgvj.