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CVE-2019-18838

7.5 · HIGH

An issue was discovered in Envoy 1.12.0.

Published Dec 13, 2019CWE-476EPSS 2.14%

Overview

CVE-2019-18838 is a high-severity vulnerability. It was published on December 13, 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

An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.

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

Refblog.envoyproxy.ioGitHubgithub.com/envoyproxy/envoy/commits/masterGitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhcRefgroups.google.com/forum/#%21forum/envoy-usersRefblog.envoyproxy.ioGitHubgithub.com/envoyproxy/envoy/commits/masterGitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhcRefgroups.google.com/forum/#%21forum/envoy-users

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18838?

CVE-2019-18838 is a high-severity vulnerability. It was published on December 13, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-18838?

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-2019-18838?

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-2019-18838?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18838 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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