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Fencer Vulns
medium 5.3

CVE-2023-32732 json

Denial-of-Service in gRPC

published 2023-06-09 3 y ago modified 2026-09-10 1 mo ago also GHSA-9hxf-ppjv-w6rq , PYSEC-2026-1426 , EUVD-2023-2014

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

gRPC contains a vulnerability whereby a client can cause a termination of connection between a HTTP2 proxy and a gRPC server: a base64 encoding error for `-bin` suffixed headers will result in a disconnection by the gRPC server, but is typically allowed by HTTP2 proxies. We recommend upgrading beyond the commit in  https://github.com/grpc/grpc/pull/32309 https://www.google.com/url

Patch / fix

  • maven io.grpc:grpc-protobuf 1.53.1, 1.54.2
  • pypi grpcio 1.53.1, 1.54.2
  • rubygems grpc 1.53.1, 1.54.2
  • Google gRPC 1.54
  • grpc grpc 1.54
  • re2 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Public Cloud 15 SP5 +5 more 20240201-150400.9.3.1
  • grpc SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Public Cloud 15 SP5 +6 more 1.60.0-150400.8.3.2
  • protobuf SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Module for Python 3 15 SP5 +16 more 25.1-150400.9.3.1
  • abseil-cpp SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Workstation Extension 15 SP5 +13 more 20230802.1-150400.10.4.1
  • python-abseil SLE Module for Python 3 15 SP5, openSUSE Leap 15.5 1.4.0-150400.9.3.1
  • python-grpcio SLE Module for Python 3 15 SP5, openSUSE Leap 15.5 1.60.0-150400.9.3.2
  • opencensus-proto openSUSE Leap 15.5 0.3.0+git.20200721-150400.9.3.1

suse advisories SUSE-SU-2024:0573-1

  • python-grpcio openSUSE Tumbleweed 1.84.0-1.1

opensuse advisories openSUSE-SU-2026:11926-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-32732 updated cvss 5.3

gRPC: denial of service

  • Red Hat OpenShift Container Platform 4 grpc, grpc-cli, grpc-plugins, python3-grpcio
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
maven io.grpc:grpc-protobuf
>=1.53.0, <1.53.1
>=1.54.0, <1.54.2
1.53.1
1.54.2
pypi grpcio
>=1.53.0, <1.53.1
>=1.54.0, <1.54.2
1.53.1
1.54.2
rubygems grpc
>=1.53.0, <1.53.1
>=1.54.0, <1.54.2
1.53.1
1.54.2

Affected products

  • Google gRPC
  • grpc grpc

Classification

Weakness
  • CWE-440 Expected Behavior Violation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.