VDB
CVE-2020-12667
CVE-2020-12667
PUBLISHED
CVSS 7.5 HIGH
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.
EPSS 2.61% · 85.3th percentile
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
2.61%
85.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:16.04:LTS | knot-resolver | 0, 1.0.0~beta3-1ubuntu0.1~esm1, * |
| Ubuntu:20.04:LTS | knot-resolver | 3.2.1-3ubuntu2.1, 0, 3.2.1-3 |
| Ubuntu:Pro:18.04:LTS | knot-resolver | 2.1.0-1, 2.1.0-2, 2.1.1-1 |
Timeline
- May 19, 2020 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Oct 27, 2021 EPSS Score
- Dec 29, 2021 EPSS Score
- Feb 4, 2022 EPSS Score
- Mar 1, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Jul 5, 2022 EPSS Score
- Sep 7, 2022 EPSS Score
- Jan 11, 2023 EPSS Score
- Mar 7, 2023 EPSS Score
References
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/ third-party-advisory
- http://cyber-security-group.cs.tau.ac.il/# third-party-advisory
- http://www.openwall.com/lists/oss-security/2020/05/19/2 third-party-advisory
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-12667 third-party-advisory
- https://ubuntu.com/security/CVE-2020-12667 advisory
- https://ubuntu.com/security/notices/USN-7047-1 advisory