Is CVE-2023-32731 actively exploited?

CVE-2023-32731 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2023-32731?

CVE-2023-32731 has a CVSS score of 7.4 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H.

How do I patch CVE-2023-32731?

Patch guidance is available from grpc security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-32731.

Fix CVE-2023-32731 - HIGH grpc grpc

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

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: high
Weaknesses: CWE-440NVD-CWE-Other

Metadata

Primary Vendor: GRPC
Published: 6/9/2023
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

grpc : grpc

Remediation Guidance

Executive Summary

Cite this page

CVE-2023-32731. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2023-32731

View on NIST NVD

CVE-2023-32731 vulnerability