CVE-2021-40083 is an assertion failure vulnerability affecting Knot Resolver versions prior to 5.3.2. This flaw can be triggered remotely by an attacker using a specific NSEC3 configuration involving excessive iterations for a positive wildcard proof. With a CVSS score of 7.5 (High), this vulnerability allows for a denial of service (availability impact) with low attack complexity and no user interaction required. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 5.3.2CPE matchmatch criteria | cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.