Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2023-32067

23
FAUCET Score

CVE-2023-32067 is a denial-of-service vulnerability affecting c-ares, an asynchronous resolver library, and its derivatives in Debian and Fedora. An attacker can craft a malformed UDP packet with a zero length, causing the target resolver to misinterpret it as a graceful connection shutdown. This vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and high impact on availability. There is currently no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.19.1CPE matchmatch criteria
cpe:2.3:a:c-ares_project:c-ares:*:*:*:*:*:*:*:*
37CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
38CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.58%
Probability of exploitation in next 30 days
EPSS Percentile
72.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0158 is in the 55th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (40)

microsoftpatch availablevia msrc
Product: cbl2 nodejs18 18.17.1-2 on CBL Mariner 2.0Fixed in: 18.17.1-2
microsoftpatch availablevia msrc
Product: cbl2 nodejs 16.20.1-2 on CBL Mariner 2.0Fixed in: 16.20.1-2
microsoftpatch availablevia msrc
Product: cbl2 grpc 1.42.0-8 on CBL Mariner 2.0Fixed in: 1.42.0-8
microsoftpatch availablevia msrc
Product: cbl2 fluent-bit 2.1.10-1 on CBL Mariner 2.0Fixed in: 2.1.10-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 1.19.1-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 2.1.10-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 1.42.0-8
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 16.20.1-2
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 1.19.1-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 2.1.10-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 1.42.0-8
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 16.20.1-2
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 1.19.1-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 1.19.1-1
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 1.62.0-2
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 1.62.0-2
microsoftpatch availablevia msrc
Product: cbl2 python-gevent 21.1.2-3 on CBL Mariner 2.0Fixed in: 21.1.2-3
microsoftpatch availablevia msrc
Product: azl3 grpc 1.42.0-7 on Azure Linux 3.0Fixed in: 1.62.0-2
microsoftpatch availablevia msrc
Product: azl3 grpc 1.62.0-2 on Azure Linux 3.0Fixed in: 1.62.0-2
microsoftpatch availablevia msrc
Product: cm1 c-ares 1.19.1-1 on CBL Mariner 1.0Fixed in: 1.19.1-1
microsoftpatch availablevia msrc
Product: cbl2 c-ares 1.19.1-1 on CBL Mariner 2.0Fixed in: 1.19.1-1
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: nodejs-1:16.18.1-4.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-nodejs14-nodejs-0:14.21.3-4.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: c-ares-0:1.10.0-3.el7_9.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: nodejs:16-8080020230608150024.63b34585
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: nodejs:18-8080020230607122508.63b34585
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: c-ares-0:1.13.0-6.el8_8.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Update Services for SAP SolutionsFixed in: c-ares-0:1.13.0-5.el8_1.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: c-ares-0:1.13.0-5.el8_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceFixed in: c-ares-0:1.13.0-5.el8_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsFixed in: c-ares-0:1.13.0-5.el8_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: c-ares-0:1.13.0-5.el8_4.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: c-ares-0:1.13.0-5.el8_4.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: c-ares-0:1.13.0-5.el8_4.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: nodejs:16-8060020230620060944.ad008a3a
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: c-ares-0:1.13.0-6.el8_6.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: c-ares-0:1.17.1-5.el9_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: nodejs:18-9020020230531092345.rhel9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: nodejs-1:16.19.1-2.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Extended Update SupportFixed in: c-ares-0:1.17.1-5.el9_0.1
View patch

Vendor Advisories (3)

microsoft2024-Dec/CVE-2023-32067

CVE-2023-32067

Dec 10, 2024
redhatCVE-2023-32067Important

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

May 22, 2023
microsoft2023-May/CVE-2023-32067Important

0-byte UDP payload DoS in c-ares

May 9, 2023

References

github.com / c-ares/c-ares/releases/tag/cares-1_19_1
Release Notes
github.com / c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc
Third Party Advisory
lists.debian.org / debian-lts-announce/2023/06/msg00034.html
Mailing List
lists.fedoraproject.org / archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7
Mailing ListThird Party Advisory
security.gentoo.org / glsa/202310-09
Third Party Advisory
security.netapp.com / advisory/ntap-20240605-0004
debian.org / security/2023/dsa-5419
Third Party Advisory