CVE catalog
CVE-2023-32067
c-ares: CVE-2023-32067
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.56% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | c-ares | sid | 1.34.9-1 | fixed |
| Debian | c-ares | forky | 1.34.8-1 | fixed |
| Debian | c-ares | trixie | 1.34.5-1+deb13u1 | fixed |
| Debian | c-ares | trixie-security | 1.34.5-1+deb13u1 | fixed |
| Debian | c-ares | bookworm | 1.18.1-3 | fixed |
| Ubuntu | c-ares | pro | 1.13.0-2 | vulnerable |
| Ubuntu | c-ares | pro | 1.13.0-3 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.2 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.2+esm1 | fixed |
| Ubuntu | c-ares | 20.04 | 1.15.0-1build1 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.2 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.3 | fixed |
| Ubuntu | c-ares | 22.04 | 1.17.1-1ubuntu1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1build1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1ubuntu0.22.04.1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1ubuntu0.22.04.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | c-ares | source | sid | 1.18.1-3 | not yet assigned | Not reported | Not reported |
| Debian | c-ares | source | forky | 1.18.1-3 | not yet assigned | Not reported | Not reported |
| Debian | c-ares | source | trixie | 1.18.1-3 | not yet assigned | Not reported | Not reported |
| Debian | c-ares | source | bookworm | 1.18.1-3 | not yet assigned | Not reported | Not reported |
| Ubuntu | c-ares | deb | pro | 1.14.0-1ubuntu0.2+esm1 | Not reported | UBUNTU-CVE-2023-32067 | Not reported |
| Ubuntu | c-ares | deb | 20.04 | 1.15.0-1ubuntu0.3 | Not reported | UBUNTU-CVE-2023-32067 | Not reported |
| Ubuntu | c-ares | deb | 22.04 | 1.18.1-1ubuntu0.22.04.2 | Not reported | UBUNTU-CVE-2023-32067 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-806742.json]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2023_3584.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-32067]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2023-32067]
- [https://security-tracker.debian.org/tracker/CVE-2023-32067]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-32067.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-2917.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]