Updated: 2026-02-27 03:42:56.769809
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.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | 0.0 | |
| CVSS Version 3.x | HIGH | 7.5 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| AlmaLinux 9.2 ESU | bind-dyndb-ldap | 11.9 | 7.5 | HIGH | Not Vulnerable | 2025-12-05 21:56:58 | ||
| AlmaLinux 9.2 ESU | dnsmasq | 2.85 | 7.5 | HIGH | Released | CLSA-2025:1745269163 | 2025-04-23 03:53:37 | |
| AlmaLinux 9.2 ESU | bind | 9.16.23 | 7.5 | HIGH | Released | CLSA-2024:1709547568 | 2024-03-04 08:42:16 | |
| AlmaLinux 9.2 ESU | unbound | 1.16.2 | 7.5 | HIGH | Released | CLSA-2024:1734532058 | 2024-12-18 22:57:02 | |
| AlmaLinux 9.2 ESU | dhcp | 4.4.2 | 7.5 | HIGH | Not Vulnerable | 2025-02-27 22:10:21 | ||
| CentOS 6 ELS | bind | 9.8.2 | 7.5 | HIGH | Released | CLSA-2024:1710437162 | 2024-03-25 09:51:17 | |
| CentOS 6 ELS | dhcp | 4.1.1 | 7.5 | HIGH | Not Vulnerable | 2024-10-11 10:45:34 | ||
| CentOS 7 ELS | unbound | 1.6.6 | 7.5 | HIGH | Released | CLSA-2024:1729513208 | 2024-11-01 10:57:17 | |
| CentOS 7 ELS | dnsmasq | 2.76 | 7.5 | HIGH | Already Fixed | 2024-10-02 14:26:03 | ||
| CentOS 7 ELS | bind | 9.11.4 | 7.5 | HIGH | Released | CLSA-2024:1709550046 | 2024-03-15 14:09:27 |