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CVE-2023-30847

8.2 · HIGH

H2O is an HTTP server.

Published Apr 27, 2023CWE-824EPSS 0.90%

Overview

CVE-2023-30847 is a high-severity vulnerability. It was published on April 27, 2023 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.

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/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33GitHubgithub.com/h2o/h2o/pull/3229GitHubgithub.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvxGitHubgithub.com/h2o/h2o/commit/f010336bab162839df43d9e87570897466c97e33GitHubgithub.com/h2o/h2o/pull/3229GitHubgithub.com/h2o/h2o/security/advisories/GHSA-p5hj-phwj-hrvx

How CyberStrike helps

Frequently asked questions

What is CVE-2023-30847?

CVE-2023-30847 is a high-severity vulnerability. It was published on April 27, 2023 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2023-30847?

This vulnerability has a CVSS 3.1 base score of 8.2, 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-2023-30847?

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-2023-30847?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-30847 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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