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CVE-2023-50868

Affected software5 products, listed below
Severity7.5 High CVSS 3.1 2 scores
WeaknessUncontrolled resource consumption (CWE-400)
Published14 Feb 2024
Updated17 Jun 2026

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.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed Published artifacts you can open, in GitHub PoC; first seen 2024-03-19.
  • EPSS 74% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99% of all scored CVEs.
IndexArtifactStarsFirst seen
GitHub PoC This project generates DNS zonefiles with custom NSEC3 parameters to reproduce and evaluate the attacks in CVE-2023-50868. 6 2024-03-19

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

7.5 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CISA-ADP Secondary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update January 2025 ↗ CPU 2025-Q1 Oracle Communications / Platform (BIND) (9.1.1.5-9.1.1.8)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Platform (BIND) 9.1.1.5-9.1.1.8

Products and versions

8 products, 20 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 10.0 · 11.0
nvd fedoraproject fedora generic 38 · 39
nvd isc bind generic ≥ 9.18.11 and < 9.18.24 · ≥ 9.0.0 and < 9.16.48 · ≥ 9.9.3 and < 9.16.48 · ≥ 9.18.0 and < 9.18.24 · ≥ 9.19.0 and < 9.19.21
nvd netapp active iq unified manager generic any version
nvd netapp bootstrap os generic any version
nvd netapp hci baseboard management controller generic any version
nvd powerdns recursor generic < 4.8.5 · ≥ 4.9.0 and < 4.9.3 · ≥ 5.0.0 and < 5.0.2
nvd redhat enterprise linux generic 6.0 · 7.0 · 8.0 · 8.2 · 8.4

References

URLTags
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 Issue Tracking, Mailing List
https://access.redhat.com/security/cve/CVE-2023-50868 Vendor Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1219826 Issue Tracking
https://datatracker.ietf.org/doc/html/rfc5155 Technical Description
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html Vendor Advisory
https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1 Release Notes
https://kb.isc.org/docs/cve-2023-50868 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html Mailing List, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html Mailing List, Vendor Advisory

Timeline

Published2024-02-14By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.