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    CVE-2023-32067

    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.

    Published:May 22, 2023
    Last Modified:Feb 13, 2025
    EPS:May 25, 2023
    EPSS Score:0.00323
    CVSS Score:7.5

    Affected Products

    Vendor
    C-ares
    Product
    C-ares
    Vendor
    C-ares Project
    Product
    C-ares
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Software Collections
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-33630 (CVSS 7.5) — c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-…
    CVE-2025-62408 (CVSS 5.9) — c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum at…
    CVE-2024-25629 (CVSS 4.4) — c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration …
    CVE-2020-22217 (CVSS 5.9) — Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_pa…
    CVE-2020-14354 (CVSS 3.3) — A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to ar…
    CVE-2017-1000381 (CVSS 7.5) — The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered …
    CVE-2016-5180 (CVSS 9.8) — Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attacke…

    References

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High