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CVE-2019-15226

7.5 · HIGH

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.

Published Oct 9, 2019CWE-400EPSS 64.52%

Overview

CVE-2019-15226 is a high-severity vulnerability. It was published on October 9, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014GitHubgithub.com/envoyproxy/envoy/commits/masterGitHubgithub.com/envoyproxy/envoy/issues/8520GitHubgithub.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014GitHubgithub.com/envoyproxy/envoy/commits/masterGitHubgithub.com/envoyproxy/envoy/issues/8520

How CyberStrike helps

Frequently asked questions

What is CVE-2019-15226?

CVE-2019-15226 is a high-severity vulnerability. It was published on October 9, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-15226?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-15226?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-15226?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-15226 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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