🛡️ CVE-2023-50868
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10
Description
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.
Details
Severity
HIGH
CVSS Score
7.5
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-400
Public Exploit
⚠️ Yes
Source
NVD
Published
2024-02-14
Updated
2026-06-08
Modified
2025-12-23
Fix URL
N/A
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| active-iq-unified-manager | — | — |
| bind | 9.19.0 | 9.19.21 |
| bootstrap-os | — | — |
| debian-linux | — | — |
| enterprise-linux | — | — |
| fedora | — | — |
| hci-baseboard-management-controller | — | — |
| recursor | 5.0.0 | 5.0.2 |
References
Issue Tracking, Mailing List http://www.openwall.com/lists/oss-security/2024/02/16/2
Issue Tracking, Mailing List http://www.openwall.com/lists/oss-security/2024/02/16/3
Vendor Advisory https://access.redhat.com/security/cve/CVE-2023-50868
Issue Tracking https://bugzilla.suse.com/show_bug.cgi?id=1219826
Technical Description https://datatracker.ietf.org/doc/html/rfc5155
Vendor Advisory https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
Third Party Advisory https://kb.isc.org/docs/cve-2023-50868
Vendor Advisory, Mailing List https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
Vendor Advisory, Mailing List https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
Mailing List, Release Notes https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
Vendor Advisory https://security.netapp.com/advisory/ntap-20240307-0008/
Exploit, Mitigation, Press/Media Coverage https://www.isc.org/blogs/2024-bind-security-release/
Issue Tracking, Mailing List http://www.openwall.com/lists/oss-security/2024/02/16/2
Issue Tracking, Mailing List http://www.openwall.com/lists/oss-security/2024/02/16/3
Vendor Advisory https://access.redhat.com/security/cve/CVE-2023-50868
Issue Tracking https://bugzilla.suse.com/show_bug.cgi?id=1219826
Technical Description https://datatracker.ietf.org/doc/html/rfc5155
Vendor Advisory https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html
Third Party Advisory https://kb.isc.org/docs/cve-2023-50868
Vendor Advisory, Mailing List https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html
Vendor Advisory, Mailing List https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html
Vendor Advisory, Mailing List https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html
Vendor Advisory, Mailing List https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVYA42BLXUCIDLD35YIJPJSHDIADNYMP/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TEXGOYGW7DBS3N2QSSQONZ4ENIRQEAPG/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQESRWMJCF4JEYJEAKLRM6CT55GLJAB7/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/[email protected]/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/[email protected]/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/
Vendor Advisory, Mailing List https://lists.fedoraproject.org/archives/list/[email protected]/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/
Mailing List, Release Notes https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2024q1/017430.html
Vendor Advisory https://security.netapp.com/advisory/ntap-20240307-0008/
Exploit, Mitigation, Press/Media Coverage https://www.isc.org/blogs/2024-bind-security-release/
Similar Threats
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