HOMEVULNERABILITIESCVE-2023-32067
HIGH

CVE-2023-32067

CWE-400Published: May 25, 2023· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-32067 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

c-ares_project1 product(s)
c-ares
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
ADVISORYhttps://security.gentoo.org/glsa/202310-09
ADVISORYhttps://www.debian.org/security/2023/dsa-5419
ADVISORYhttps://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vc
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
ADVISORYhttps://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
ADVISORYhttps://security.gentoo.org/glsa/202310-09
ADVISORYhttps://www.debian.org/security/2023/dsa-5419

All References (16)

→
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1Release Notes
→
https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vcThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/06/msg00034.htmlMailing List
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202310-09Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20240605-0004/
→
https://www.debian.org/security/2023/dsa-5419Third Party Advisory
→
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1Release Notes
→
https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vcThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2023/06/msg00034.htmlMailing List
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/[email protected]/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202310-09Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20240605-0004/

Quick Facts

CVE IDCVE-2023-32067
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
Affected3 vendor(s)
PublishedMay 25, 2023

Related CVEs (CWE-400)

CVE-2013-20004
9.8
CVE-2017-1000378
9.8
CVE-2025-24190
9.8
CVE-2024-39462
9.8
CVE-2024-45166
9.8
CVE-2022-48716
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-32067 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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