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CVE-2023-50868

Published: Feb 14, 2024Updated: Dec 23, 2025 Sources: CVE List NVD BDU csafCWE-400
7.5HIGH
NVD MITRE
EPSS Score
81.7%
Top 0.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-400

Affected Products

bindiscNetworking Infrastructure
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
debian linuxdebian
On-premOS
Operating Systems / linux-distro
enterprise linuxredhat
On-premOS
Operating Systems / linux-distro
recursorpowerdns
On-premNetwork Device
Networking Infrastructure / dns-dhcp-ntp
isccommercialUSNetworking Infrastructureaka internet systems consortium
fedoraprojectoss-projectUSOperating Systemsaka fedora project
debianoss-projectGBOperating Systemsaka debian gnu/linux
redhatcommercialUSOperating Systemsaka red hat
powerdnsoss-projectDKNetworking Infrastructureaka powerdns recursor, powerdns authoritative, dnsdist
and 17 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

http://www.openwall.com/lists/oss-security/2024/02/16/2
openwall.com
http://www.openwall.com/lists/oss-security/2024/02/16/3
openwall.com
https://access.redhat.com/security/cve/CVE-2023-50868
access.redhat.com
and 58 more references View all →

Timeline

Published
Feb 14, 2024
Last Updated
Dec 23, 2025

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