Intrusion Prevention

Envoy.HTTP.Headers.DoS

Description

This indicates an attack attempt to exploit a Denial of Service Vulnerability in Envoy.
A remote, unauthenticated attacker can exploit this vulnerability by sending many requests with a large number of small headers. Successful exploitation results in excessive CPU usage on the target system, leading to denial of service conditions.

Affected Products

Envoy Envoy 1.10.0 through 1.11.1

Impact

Denial of Service: Remote attackers can crash vulnerable systems.

Recommended Actions

Apply the most recent upgrade or patch from the vendor.
https://github.com/envoyproxy/envoy/issues/8520

CVE References

CVE-2019-15226