CVE-2019-15226 Denial of service in n/a
Remote attackers can cause CPU exhaustion and denial of service in Envoy proxy by sending requests with many small headers due to inefficient header size validation.
- 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-2019-15226?
CVE-2019-15226 is a high-severity denial of service vulnerability in Envoyproxy Envoy, published on 9 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Upon receiving each incoming request header data, Envoy will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in versions 1.10.0 through 1.11.1 for HTTP/1.x traffic and all versions of Envoy for HTTP/2 traffic had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.
Weakness: CWE-400
Which versions are affected by CVE-2019-15226?
It affects 1 product.
Products include Envoyproxy Envoy.
How do I fix CVE-2019-15226?
No fix has been published for CVE-2019-15226 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-2019-15226 being exploited?
There is no known exploitation of CVE-2019-15226 in the wild and no public exploit code.
Other vulnerabilities in Envoyproxy Envoy
Sources
Also known as GHSA-cggr-h689-7v7x.