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    CVE-2023-50868

    The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

    Published:Feb 13, 2024
    Last Modified:Dec 23, 2025
    EPS:Feb 14, 2024
    EPSS Score:0.43882
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Isc
    Product
    Bind
    Vendor
    Netapp
    Product
    Active Iq Unified Manager
    Vendor
    Netapp
    Product
    Bootstrap Os
    Vendor
    Netapp
    Product
    H300s
    Vendor
    Netapp
    Product
    H410c
    Vendor
    Netapp
    Product
    H410s
    Vendor
    Netapp
    Product
    H500s
    Vendor
    Netapp
    Product
    H700s
    Vendor
    Netapp
    Product
    Hci Baseboard Management Controller
    Vendor
    Netapp
    Product
    Hci Compute Node
    Vendor
    Powerdns
    Product
    Recursor
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus

    Exploits

    https://www.isc.org/blogs/2024-bind-security-release/https://www.isc.org/blogs/2024-bind-security-release/https://github.com/Goethe-Universitat-Cybersecurity/NSEC3-Encloser-Attack

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    CVE-2026-49975 (CVSS 7.5) — Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of …
    CVE-2026-9256 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…
    CVE-2026-31431 (CVSS 7.8) — In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating …
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    References

    http://www.openwall.com/lists/oss-security/2024/02/16/2
    http://www.openwall.com/lists/oss-security/2024/02/16/3
    https://access.redhat.com/security/cve/CVE-2023-50868
    https://bugzilla.suse.com/show_bug.cgi?id=1219826
    https://datatracker.ietf.org/doc/html/rfc5155
    https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
    https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
    https://kb.isc.org/docs/cve-2023-50868
    https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
    https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
    https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
    https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
    https://security.netapp.com/advisory/ntap-20240307-0008/
    https://www.isc.org/blogs/2024-bind-security-release/
    http://www.openwall.com/lists/oss-security/2024/02/16/2
    http://www.openwall.com/lists/oss-security/2024/02/16/3
    https://access.redhat.com/security/cve/CVE-2023-50868
    https://bugzilla.suse.com/show_bug.cgi?id=1219826
    https://datatracker.ietf.org/doc/html/rfc5155
    https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
    https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
    https://kb.isc.org/docs/cve-2023-50868
    https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
    https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
    https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
    https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
    https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
    https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
    https://security.netapp.com/advisory/ntap-20240307-0008/
    https://www.isc.org/blogs/2024-bind-security-release/

    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