CVE-2020-12667
- State
- Published
- Severity
- 7.5 High
- Published
- May 19, 2020
- Updated
- Aug 4, 2024
- Reserved
- May 5, 2020
Description
Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
References
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
- [oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigationmailing-list
- http://cyber-security-group.cs.tau.ac.il/#
- FEDORA-2020-bf68101ad3vendor-advisory
- [debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security updatemailing-list
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