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.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 14 products from isc, from fedoraproject, from debian and 11 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2024, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2024-02-14T16:15:45.377
2025-12-23T20:20:08.930
Analyzed
CVSSv3.1: 7.5 (HIGH)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | isc | bind | < 9.16.48 | Yes |
| Application | isc | bind | < 9.16.48 | Yes |
| Application | isc | bind | < 9.18.24 | Yes |
| Application | isc | bind | < 9.18.24 | Yes |
| Application | isc | bind | < 9.19.21 | Yes |
| Operating System | fedoraproject | fedora | 38 | Yes |
| Operating System | fedoraproject | fedora | 39 | Yes |
| Operating System | debian | debian_linux | 10.0 | Yes |
| Operating System | debian | debian_linux | 11.0 | Yes |
| Operating System | redhat | enterprise_linux | 6.0 | Yes |
| Operating System | redhat | enterprise_linux | 7.0 | Yes |
| Operating System | redhat | enterprise_linux | 8.0 | Yes |
| Operating System | redhat | enterprise_linux | 8.2 | Yes |
| Operating System | redhat | enterprise_linux | 8.4 | Yes |
| Application | powerdns | recursor | < 4.8.5 | Yes |
| Application | powerdns | recursor | < 4.9.3 | Yes |
| Application | powerdns | recursor | < 5.0.2 | Yes |
| Operating System | netapp | bootstrap_os | - | Yes |
| Hardware | netapp | hci_compute_node | - | No |
| Application | netapp | active_iq_unified_manager | - | Yes |
| Application | netapp | hci_baseboard_management_controller | - | Yes |
| Hardware | netapp | h300s | - | No |
| Hardware | netapp | h410c | - | No |
| Hardware | netapp | h410s | - | No |
| Hardware | netapp | h500s | - | No |
| Hardware | netapp | h700s | - | No |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For isc's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.