Is CVE-2023-32731 actively exploited?

No active exploitation of CVE-2023-32731 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-32731 be exploited remotely?

Yes. CVE-2023-32731 is exploitable remotely over the network (CVSS attack vector: Network).

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

CVE-2023-32731 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2023-32731

CWE-440Published: June 9, 2023· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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

NVD Source

Technical Analysis

CVE-2023-32731 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.