CVE-2016-4817 Use after free in n/a

High 7.5 Published 19 Jun 2016 Updated 6 Aug 2024

Remote attackers can cause denial of service or execute arbitrary code via crafted packets due to improper handling of HTTP/2 disconnections.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2016-4817?

CVE-2016-4817 is a high-severity use after free vulnerability in n/a, published on 19 Jun 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.

Which versions are affected by CVE-2016-4817?

It affects 1 product.

Products include Dena H2o.

How do I fix CVE-2016-4817?

No fix has been published for CVE-2016-4817 yet. Limit exposure of the affected software until one is available.

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-2016-4817 being exploited?

There is no known exploitation of CVE-2016-4817 in the wild and no public exploit code.

Sources

Also known as GHSA-32wr-c4w3-hg28.