CVE-2023-50387

7.5 HIGH
Published: February 14, 2024 Modified: November 04, 2025
View on NVD

Description

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/02/16/2
Source: cve@mitre.org
Mailing List
http://www.openwall.com/lists/oss-security/2024/02/16/3
Source: cve@mitre.org
Mailing List
https://access.redhat.com/security/cve/CVE-2023-50387
Source: cve@mitre.org
Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219823
Source: cve@mitre.org
Issue Tracking
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
Source: cve@mitre.org
Third Party Advisory
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
Source: cve@mitre.org
Patch
https://kb.isc.org/docs/cve-2023-50387
Source: cve@mitre.org
Third Party Advisory VDB Entry
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
Source: cve@mitre.org
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Source: cve@mitre.org
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
Source: cve@mitre.org
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
Source: cve@mitre.org
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
Source: cve@mitre.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
Source: cve@mitre.org
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
Source: cve@mitre.org
Mailing List Third Party Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
Source: cve@mitre.org
Patch Vendor Advisory
https://news.ycombinator.com/item?id=39367411
Source: cve@mitre.org
Third Party Advisory
https://news.ycombinator.com/item?id=39372384
Source: cve@mitre.org
Issue Tracking
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
Source: cve@mitre.org
Vendor Advisory
https://security.netapp.com/advisory/ntap-20240307-0007/
Source: cve@mitre.org
https://www.athene-center.de/aktuelles/key-trap
Source: cve@mitre.org
Third Party Advisory
https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
Source: cve@mitre.org
Technical Description Third Party Advisory
https://www.isc.org/blogs/2024-bind-security-release/
Source: cve@mitre.org
Third Party Advisory
https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
Source: cve@mitre.org
Press/Media Coverage Third Party Advisory
https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
Source: cve@mitre.org
Patch Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/02/16/2
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
http://www.openwall.com/lists/oss-security/2024/02/16/3
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
https://access.redhat.com/security/cve/CVE-2023-50387
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219823
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
Source: af854a3a-2127-422b-91ae-364da2661108
Patch
https://kb.isc.org/docs/cve-2023-50387
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
https://news.ycombinator.com/item?id=39367411
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://news.ycombinator.com/item?id=39372384
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
https://security.netapp.com/advisory/ntap-20240307-0007/
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.athene-center.de/aktuelles/key-trap
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
Source: af854a3a-2127-422b-91ae-364da2661108
Technical Description Third Party Advisory
https://www.isc.org/blogs/2024-bind-security-release/
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
Source: af854a3a-2127-422b-91ae-364da2661108
Press/Media Coverage Third Party Advisory
https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Third Party Advisory

66 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
46.1%
98th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-770 CWE-770

Affected Vendors

microsoft redhat nlnetlabs nic thekelleys powerdns isc fedoraproject

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