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Fencer Vulns
high 7.5

CVE-2023-32067 json

0-byte UDP payload DoS in c-ares

published 2023-05-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-36348

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.

Patch / fix

  • c-ares c-ares 1.19.1
  • c-ares Debian 14, Debian 13, Debian 12 1.18.1-3

debian advisories DEBIAN-CVE-2023-32067

  • c-ares Ubuntu 20.04 LTS 1.15.0-1ubuntu0.3
  • c-ares Ubuntu 22.04 LTS 1.18.1-1ubuntu0.22.04.2
  • c-ares Ubuntu Pro 16.04 LTS 1.10.0-3ubuntu0.2+esm2
  • c-ares Ubuntu Pro 18.04 LTS 1.14.0-1ubuntu0.2+esm1

ubuntu advisories UBUNTU-CVE-2023-32067

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • npm RHEL 8 1:9.5.0-1.18.14.2.3.module+el8.8.0+19021+4b8b11cc
  • nodejs RHEL 8 1:18.14.2-3.module+el8.8.0+19021+4b8b11cc
  • nodejs-nodemon RHEL 8 2.0.20-2.module+el8.8.0+18432+27f188ac
  • nodejs-full-i18n RHEL 8 1:18.14.2-3.module+el8.8.0+19021+4b8b11cc
  • nodejs-packaging RHEL 8 2021.06-4.module+el8.7.0+15582+19c314fa
  • nodejs-packaging-bundler RHEL 8 2021.06-4.module+el8.7.0+15582+19c314fa
  • npm RHEL 8 1:8.19.3-1.16.19.1.2.module+el8.8.0+19038+6f60344f
  • nodejs RHEL 8 1:16.19.1-2.module+el8.8.0+19038+6f60344f

red hat advisories RHSA-2023:4035RHSA-2023:4034RHSA-2023:4033RHSA-2023:3662RHSA-2023:4036RHSA-2023:3660

  • nodejs16 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +3 more 16.20.1-150300.7.24.2
  • nodejs18 SLE Module for Web and Scripting 15 SP5, SLE Module for Web and Scripting 15 SP4, openSUSE Leap 15.5 +1 more 18.16.1-150400.9.9.1
  • nodejs16 SLE Module for Web and Scripting 15 SP4, openSUSE Leap 15.4 16.20.1-150400.3.21.1
  • nodejs18 SLE Module for Web and Scripting 12 18.16.1-8.9.1
  • nodejs16 SLE Module for Web and Scripting 12 16.20.1-8.30.1
  • libcares2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +7 more 1.9.1-9.12.1
  • c-ares SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +21 more 1.19.1-150000.3.23.1

suse advisories SUSE-SU-2023:2861-1SUSE-SU-2023:2669-1SUSE-SU-2023:2663-1SUSE-SU-2023:2662-1SUSE-SU-2023:2655-1SUSE-SU-2023:2477-1

  • c-ares openSUSE Tumbleweed 1.19.1-1.1

opensuse advisories openSUSE-SU-2024:12951-1

  • npm AlmaLinux 8 1:8.19.3-1.16.19.1.2.module_el8.8.0+3586+d4fc0b72
  • nodejs AlmaLinux 8 1:16.19.1-2.module_el8.8.0+3586+d4fc0b72
  • nodejs-nodemon AlmaLinux 8 2.0.20-3.module_el8.8.0+3586+d4fc0b72
  • nodejs-full-i18n AlmaLinux 8 1:16.19.1-2.module_el8.8.0+3586+d4fc0b72
  • nodejs-packaging AlmaLinux 8 25-1.module_el8.5.0+2605+45d748af
  • npm AlmaLinux 8 1:9.5.0-1.18.14.2.3.module_el8.8.0+3587+ee652244
  • nodejs AlmaLinux 8 1:18.14.2-3.module_el8.8.0+3587+ee652244
  • nodejs-nodemon AlmaLinux 8 2.0.20-2.module_el8.8.0+3587+ee652244

almalinux advisories ALSA-2023:4034ALSA-2023:4035ALSA-2023:3577ALSA-2023:3584ALSA-2023:3586ALSA-2023:3559

  • nodejs Rocky Linux 8 1:16.19.1-2.module+el8.8.0+1338+00a07a77
  • nodejs-nodemon Rocky Linux 8 2.0.20-3.module+el8.7.0+1178+d52dba78
  • nodejs-packaging Rocky Linux 8 25-1.module+el8.7.0+1108+49363b0d
  • nodejs Rocky Linux 8 1:18.14.2-3.module+el8.8.0+1337+7ea46b57
  • nodejs-nodemon Rocky Linux 8 2.0.20-2.module+el8.7.0+1177+510ae886
  • nodejs-packaging Rocky Linux 8 2021.06-4.module+el8.7.0+1072+5b168780
  • nodejs-nodemon Rocky Linux 9 2.0.20-2.module+el9.6.0+32048+5323bb50
  • nodejs-packaging Rocky Linux 9 2021.06-4.module+el9.5.0+31770+0da7192d

rocky linux advisories RLSA-2023:4034RLSA-2023:4035RLSA-2023:3577RLSA-2023:3584RLSA-2023:3559

  • c-ares CBL-Mariner 2.0 1.19.1-1
  • fluent-bit CBL-Mariner 2.0 2.1.10-1
  • grpc CBL-Mariner 2.0 1.42.0-8
  • nodejs CBL-Mariner 2.0 16.20.1-2
  • nodejs18 CBL-Mariner 2.0 18.17.1-2
  • python-gevent CBL-Mariner 2.0 21.1.2-3
  • grpc Azure Linux 3.0 1.62.0-2

azure linux advisories AZL-26913AZL-26918AZL-26921AZL-26937AZL-26939AZL-26942

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-2023-32067 updated cvss 7.5

c-ares: 0-byte UDP payload Denial of Service

  • Red Hat Enterprise Linux 6 c-ares
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 16.19.1-2.module+el8.8.0+19038+6f60344f, nodejs 18.14.2-3.module+el8.8.0+19021+4b8b11cc, nodejs-packaging 25-1.module+el8.5.0+10992+fac5fe06, npm 9.5.0-1.18.14.2.3.module+el8.8.0+19021+4b8b11cc, npm 8.19.3-1.16.19.1.2.module+el8.8.0+19038+6f60344f, nodejs-nodemon 2.0.20-2.module+el8.8.0+18432+27f188ac, +5 more
    fixed: vendor fix RHSA-2023:4034
  • Red Hat Enterprise Linux AppStream (v. 9) nodejs 16.19.1-2.el9_2, nodejs-libs 16.19.1-2.el9_2, npm 8.19.3-1.16.19.1.2.el9_2, nodejs-full-i18n 16.19.1-2.el9_2, nodejs 18.14.2-3.module+el9.2.0.z+18964+42696395, npm 9.5.0-1.18.14.2.3.module+el9.2.0.z+18964+42696395, +4 more
    fixed: vendor fix RHSA-2023:3559
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) nodejs 16.19.1-2.module+el8.6.0+19139+7f27a8ff, nodejs-packaging 25-1.module+el8.5.0+10992+fac5fe06, npm 8.19.3-1.16.19.1.2.module+el8.6.0+19139+7f27a8ff, nodejs-nodemon 2.0.20-3.module+el8.6.0+19139+7f27a8ff, nodejs-full-i18n 16.19.1-2.module+el8.6.0+19139+7f27a8ff
    fixed: vendor fix RHSA-2023:4033
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) nodejs 16.18.1-4.el9_0, nodejs-libs 16.18.1-4.el9_0, npm 8.19.2-1.16.18.1.4.el9_0, nodejs-full-i18n 16.18.1-4.el9_0
    fixed: vendor fix RHSA-2023:3583
  • Red Hat Enterprise Linux BaseOS (v. 8) c-ares 1.13.0-6.el8_8.2
    fixed: vendor fix RHSA-2023:3584
  • Red Hat Enterprise Linux BaseOS (v. 9) c-ares 1.17.1-5.el9_2.1
    fixed: vendor fix RHSA-2023:3559
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) c-ares 1.13.0-5.el8_2.1
    fixed: vendor fix RHSA-2023:3660
show 10 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) c-ares 1.13.0-5.el8_4.2
    fixed: vendor fix RHSA-2023:3677
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) c-ares 1.13.0-5.el8_1.1
    fixed: vendor fix RHSA-2023:3665
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.2) c-ares 1.13.0-5.el8_2.1
    fixed: vendor fix RHSA-2023:3660
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) c-ares 1.13.0-5.el8_4.2
    fixed: vendor fix RHSA-2023:3677
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) c-ares 1.13.0-6.el8_6.1
    fixed: vendor fix RHSA-2023:3662
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) c-ares 1.17.1-5.el9_0.1
    fixed: vendor fix RHSA-2023:3583
  • Red Hat Enterprise Linux BaseOS TUS (v. 8.2) c-ares 1.13.0-5.el8_2.1
    fixed: vendor fix RHSA-2023:3660
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) c-ares 1.13.0-5.el8_4.2
    fixed: vendor fix RHSA-2023:3677
  • Red Hat Enterprise Linux Client (v. 7) c-ares 1.10.0-3.el7_9.1 Red Hat Enterprise Linux Client Optional (v. 7) c-ares-devel 1.10.0-3.el7_9.1, c-ares-debuginfo 1.10.0-3.el7_9.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) c-ares-devel 1.10.0-3.el7_9.1, c-ares-debuginfo 1.10.0-3.el7_9.1 Red Hat Enterprise Linux Server (v. 7) c-ares 1.10.0-3.el7_9.1 Red Hat Enterprise Linux Workstation (v. 7) c-ares 1.10.0-3.el7_9.1
    fixed: vendor fix RHSA-2023:3741
  • Red Hat Software Collections for RHEL Workstation(v. 7) rh-nodejs14-nodejs 14.21.3-4.el7, rh-nodejs14-npm 6.14.18-14.21.3.4.el7, rh-nodejs14-nodejs-full-i18n 14.21.3-4.el7 Red Hat Software Collections for RHEL(v. 7) rh-nodejs14-nodejs 14.21.3-4.el7, rh-nodejs14-npm 6.14.18-14.21.3.4.el7, rh-nodejs14-nodejs-full-i18n 14.21.3-4.el7
    fixed: vendor fix RHSA-2023:4039

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 ICSA-24-046-11 updated cvss 7.5

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% 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

Affected products

  • c-ares c-ares
  • fedoraproject fedora
  • debian debian_linux

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.