CVE-2023-32731

HIGH
Published Jun 9, 20233y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Jun 9, 2023 3y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-440

Affected Products 1

VendorProductVersionRange
grpcgrpc*≥1.53.0  –  <1.55.0

References 2

  • github.com https://github.com/grpc/grpc/pull/32309
    Patch
  • github.com https://github.com/grpc/grpc/pull/33005
    Patch

Remediation

  • github.com https://github.com/grpc/grpc/pull/32309
    Patch
  • github.com https://github.com/grpc/grpc/pull/33005
    Patch