CVE-2023-50387
- State
- Published
- Severity
- 7.5 High
- Published
- Feb 14, 2024
- Updated
- Nov 4, 2025
- Reserved
- Dec 7, 2023
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
References
- https://www.athene-center.de/aktuelles/key-trap
- https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/
- https://kb.isc.org/docs/cve-2023-50387
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
- https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/
- https://news.ycombinator.com/item?id=39367411
- https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/
- https://www.isc.org/blogs/2024-bind-security-release/
- https://news.ycombinator.com/item?id=39372384
- https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387
- https://access.redhat.com/security/cve/CVE-2023-50387
- https://bugzilla.suse.com/show_bug.cgi?id=1219823
- https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf
- [oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilitiesmailing-list
- [oss-security] 20240216 Re: Unbound: disclosure of CVE-2023-50387 and CVE-2023-50868 DNSSEC validation vulnerabilitiesmailing-list
- FEDORA-2024-2e26eccfcbvendor-advisory
- FEDORA-2024-e24211eff0vendor-advisory
- FEDORA-2024-21310568favendor-advisory
- [debian-lts-announce] 20240221 [SECURITY] [DLA 3736-1] unbound security updatemailing-list
- FEDORA-2024-b0f9656a76vendor-advisory
- FEDORA-2024-4e36df9dfdvendor-advisory
- FEDORA-2024-499b9be35fvendor-advisory
- FEDORA-2024-c36c448396vendor-advisory
- FEDORA-2024-c967c7d287vendor-advisory
- FEDORA-2024-e00eceb11cvendor-advisory
- FEDORA-2024-fae88b73ebvendor-advisory
- https://security.netapp.com/advisory/ntap-20240307-0007/
- [debian-lts-announce] 20240517 [SECURITY] [DLA 3816-1] bind9 security updatemailing-list
- https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
- https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.