CVEvulnerability

CVE-2019-15226

7.5 HIGH Published 2019-10-09 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2019-10-09
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
7.8 HIGH — AV:N/AC:L/Au:N/C:N/I:N/A:C
Weaknesses
CWE-400

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.

Affected configurations

• envoyproxy envoy 1.0.0 • envoyproxy envoy 1.1.0 • envoyproxy envoy 1.2.0 • envoyproxy envoy 1.3.0 • envoyproxy envoy 1.4.0 • envoyproxy envoy 1.5.0 • envoyproxy envoy 1.6.0 • envoyproxy envoy 1.7.0 • envoyproxy envoy 1.7.1 • envoyproxy envoy 1.8.0 • envoyproxy envoy 1.9.0 • envoyproxy envoy 1.9.1 • envoyproxy envoy 1.10.0 • envoyproxy envoy 1.11.0 • envoyproxy envoy 1.11.1 • envoyproxy envoy 1.11.2

Related

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References