7.5

CVE-2020-12667: nic knot_resolver Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-12667DEBIAN-CVE-2020-12667
Published 19-05-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-12667 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in nic knot_resolver. EPSS estimates a 2.61% chance of exploitation in the next 30 days, higher than 85.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
2.61%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
DLA-3795-1USN-7047-1

Timeline

  1. 19-05-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

2.61%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

-0.01 pp

From 2.62% on 18-09-2026

18-09-202618-10-2026
EPSS score
2.61%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • knot-resolver< 5.1.1-0.1
Nic1 product
Ubuntu1 product
  • knot-resolverAll versions (No fix recorded) | < 3.2.1-3ubuntu2.2

3 vendors · 3 products

References

10 links