Is CVE-2023-50868 actively exploited?

CVE-2023-50868 has no public evidence of in-the-wild exploitation as of 2025-12-23.

What is the CVSS score for CVE-2023-50868?

CVE-2023-50868 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2023-50868?

Patch guidance is available from isc security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-50868.

Which products are affected by CVE-2023-50868?

20 products: isc bind, isc bind, isc bind, isc bind, isc bind, and 15 more.

Fix CVE-2023-50868 - HIGH isc bind

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-400

Metadata

Primary Vendor: ISC
Published: 2/14/2024
Last Modified: 12/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

isc : bindisc : bindisc : bindisc : bindisc : bindfedoraproject : fedorafedoraproject : fedoradebian : debian_linuxdebian : debian_linuxredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linuxpowerdns : recursorpowerdns : recursorpowerdns : recursornetapp : bootstrap_osnetapp : active_iq_unified_managernetapp : hci_baseboard_management_controller

Remediation Guidance

Executive Summary

View on NIST NVD