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    CVE-2023-50387

    Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the "KeyTrap" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.

    Published:Feb 13, 2024
    Last Modified:Nov 4, 2025
    EPS:Feb 14, 2024
    EPSS Score:0.39615
    CVSS Score:7.5

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Isc
    Product
    Bind
    Vendor
    Microsoft
    Product
    Windows Server 2008
    Vendor
    Microsoft
    Product
    Windows Server 2012
    Vendor
    Microsoft
    Product
    Windows Server 2016
    Vendor
    Microsoft
    Product
    Windows Server 2019
    Vendor
    Microsoft
    Product
    Windows Server 2022
    Vendor
    Microsoft
    Product
    Windows Server 2022 23h2
    Vendor
    Nic
    Product
    Knot Resolver
    Vendor
    Nlnetlabs
    Product
    Unbound
    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
    Vendor
    Thekelleys
    Product
    Dnsmasq

    Exploits

    https://github.com/knqyf263/CVE-2023-50387https://github.com/Meirelez/SSR-DNSSEChttps://github.com/Pablodiz/CVE-2023-50387

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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-2023-50387
    https://bugzilla.suse.com/show_bug.cgi?id=1219823
    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-2023-50387
    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://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
    https://news.ycombinator.com/item?id=39367411
    https://news.ycombinator.com/item?id=39372384
    https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
    https://security.netapp.com/advisory/ntap-20240307-0007/
    https://www.athene-center.de/aktuelles/key-trap
    https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
    https://www.isc.org/blogs/2024-bind-security-release/
    https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
    https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
    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-2023-50387
    https://bugzilla.suse.com/show_bug.cgi?id=1219823
    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-2023-50387
    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/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
    https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
    https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
    https://news.ycombinator.com/item?id=39367411
    https://news.ycombinator.com/item?id=39372384
    https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
    https://security.netapp.com/advisory/ntap-20240307-0007/
    https://www.athene-center.de/aktuelles/key-trap
    https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
    https://www.isc.org/blogs/2024-bind-security-release/
    https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
    https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/

    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