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Fencer Vulns
high 7.5

CVE-2023-4785 json

Denial of Service in gRPC Core

published 2023-09-13 3 y ago modified 2026-09-10 1 mo ago also GHSA-p25m-jpj4-qcrr , PYSEC-2026-1428 , EUVD-2023-2551

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

Lack of error handling in the TCP server in Google's gRPC starting version 1.23 on posix-compatible platforms (ex. Linux) allows an attacker to cause a denial of service by initiating a significant number of connections with the server. Note that gRPC C++ Python, and Ruby are affected, but gRPC Java, and Go are NOT affected.

Patch / fix

  • rubygems grpc 1.53.2, 1.54.3, 1.55.3, 1.56.2
  • pypi grpcio 1.53.2, 1.54.3, 1.55.3
  • Google gRPC 1.53.2, 1.54.3, 1.55.3, 1.56.2, 1.57
  • grpc grpc 1.23
  • candlepin satellite 6.14 4.3.11-1.el8sat
  • mosquitto satellite capsule 6.14, satellite 6.14 2.0.17-1.el8sat
  • puppet-agent satellite capsule 6.14, satellite 6.14 7.27.0-1.el8sat
  • puppetserver satellite capsule 6.14, satellite 6.14 7.14.0-1.el8sat
  • rubygem-grpc satellite 6.14 1.58.0-1.el8sat
  • rubygem-puma satellite 6.14 6.3.1-1.el8sat
  • rubygem-sidekiq satellite 6.14 6.5.12-1.el8sat
  • candlepin-selinux satellite 6.14 4.3.11-1.el8sat

red hat advisories RHSA-2024:0797

  • 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

  • grpc Azure Linux 3.0 1.62.0-2

azure linux advisories AZL-34772

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-4785 updated cvss 7.5

gRPC: file descriptor exhaustion leads to denial of service

  • Red Hat Satellite 6.14 for RHEL 8 rubygem-grpc 1.58.0-1.el8sat
    fixed: vendor fix RHSA-2024:0797
  • Red Hat OpenShift Container Platform 4 grpc, grpc-cli, grpc-plugins, python3-grpcio, openshift4/ose-kuryr-cni-rhel8, openshift4/ose-kuryr-controller-rhel8 Red Hat Satellite 6.14 for RHEL 8 candlepin 4.3.11-1.el8sat, foreman 3.7.0.11-2.el8sat, mosquitto 2.0.17-1.el8sat, satellite 6.14.2-1.el8sat, rubygem-kafo 7.2.0-1.el8sat, rubygem-puma 6.3.1-1.el8sat, +27 more
    not affected: vulnerable code not present

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

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
rubygems grpc
>=1.56.0, <1.56.2
>=1.55.0, <1.55.3
>=1.54.0, <1.54.3
>=1.53.0, <1.53.2
1.56.2
1.55.3
1.54.3
1.53.2
pypi grpcio
>=1.55.0, <1.55.3
>=1.54.0, <1.54.3
>=1.53.0, <1.53.2
1.55.3
1.54.3
1.53.2

Affected products

  • Google gRPC
  • grpc grpc

Classification

Weakness

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.