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CVE-2023-32731

7.4 · HIGH

When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame.

Published Jun 9, 2023CWE-440EPSS 0.50%

Overview

CVE-2023-32731 is a high-severity vulnerability. It was published on June 9, 2023 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

When gRPC HTTP2 stack raised a header size exceeded error, it skipped parsing the rest of the HPACK frame. This caused any HPACK table mutations to also be skipped, resulting in a desynchronization of HPACK tables between sender and receiver. If leveraged, say, between a proxy and a backend, this could lead to requests from the proxy being interpreted as containing headers from different proxy clients - leading to an information leak that can be used for privilege escalation or data exfiltration. We recommend upgrading beyond the commit contained in  https://github.com/grpc/grpc/pull/33005 https://github.com/grpc/grpc/pull/33005

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/grpc/grpc/pull/32309GitHubgithub.com/grpc/grpc/pull/33005GitHubgithub.com/grpc/grpc/pull/32309GitHubgithub.com/grpc/grpc/pull/33005

How CyberStrike helps

Frequently asked questions

What is CVE-2023-32731?

CVE-2023-32731 is a high-severity vulnerability. It was published on June 9, 2023 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2023-32731?

This vulnerability has a CVSS 3.1 base score of 7.4, 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-2023-32731?

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-2023-32731?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-32731 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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