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CVE-2023-32731

HIGH
Published 2023-06-09T10:54:08.472Z
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CVSS Score

V3.1
7.4
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.161
Higher than 16.1% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
NONE
Availability
HIGH

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

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Google

gRPC

Affected Versions:

1.53
grpc

grpc

Affected Versions:

1.53

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed HIGH

Connection confusion in gRPC

GHSA-cfgp-2977-2fmm

Advisory Details

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.

Affected Packages

Maven io.grpc:grpc-protobuf
ECOSYSTEM: ≥1.53.0 <1.53.1
PyPI grpcio
ECOSYSTEM: ≥1.53.0 <1.53.1
RubyGems grpc
ECOSYSTEM: ≥1.53.0 <1.53.1
PyPI grpcio
ECOSYSTEM: ≥1.54.0 <1.54.2
RubyGems grpc
ECOSYSTEM: ≥1.54.0 <1.54.2
Maven io.grpc:grpc-protobuf
ECOSYSTEM: ≥1.54.0 <1.54.2

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-32731
WEB https://github.com/grpc/grpc/issues/33463
WEB https://github.com/grpc/grpc/pull/32309
WEB https://github.com/grpc/grpc/pull/33005
WEB https://github.com/grpc/grpc/commit/29d8beee0ac2555773b2a2dda5601c74a95d6c10
WEB https://github.com/grpc/grpc/commit/65a2a895afaf1d2072447b9baf246374b182a946
WEB https://github.com/grpc/grpc/releases/tag/v1.53.1
WEB https://github.com/grpc/grpc/releases/tag/v1.54.2
WEB https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-32731.yml

Advisory provided by GitHub Security Advisory Database. Published: July 5, 2023, Modified: August 13, 2025

References

https://github.com/grpc/grpc/pull/32309
https://github.com/grpc/grpc/pull/33005
Published: 2023-06-09T10:54:08.472Z
Last Modified: 2024-09-26T19:12:06.245Z
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