CVE-2018-6347 Denial of service in Proxygen

High 7.5 Published 31 Dec 2018 Updated 6 May 2025

Attackers can cause a denial of service in applications using the Proxygen library by sending malformed HTTP2 headers or trailers.

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-2018-6347?

CVE-2018-6347 is a high-severity denial of service vulnerability in Facebook Proxygen, published on 31 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue in the Proxygen handling of HTTP2 parsing of headers/trailers can lead to a denial-of-service attack. This affects Proxygen prior to v2018.12.31.00.

Weakness: CWE-20, CWE-400

Which versions are affected by CVE-2018-6347?

It affects 1 product.

Products include Proxygen Project Proxygen.

How do I fix CVE-2018-6347?

No fix has been published for CVE-2018-6347 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-2018-6347 being exploited?

There is no known exploitation of CVE-2018-6347 in the wild and no public exploit code.

Sources

Also known as GHSA-95px-qh9x-29gf.