VULNERABILITY INTELLIGENCE

CVE-2023-32731

CVSS score7.4 HIGH
EPSS probability0.50%
CISA KEVNot currently listed
Published2023-06-09
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

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

Weakness classification

  • cve-coordination@google.com: CWE-440
  • nvd@nist.gov: NVD-CWE-Other

Primary references