7.5

CVE-2019-10191: cz.nic knot-resolver Improper Input Validation

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2019-10191DEBIAN-CVE-2019-10191
Published 16-07-2019Last modified 13-02-2025
Open JSON

Vulnerability summary

CVE-2019-10191 is a high (CVSS 7.5) Improper Input Validation vulnerability in cz.nic knot-resolver. EPSS estimates a 1.93% chance of exploitation in the next 30 days, higher than 79.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.93%
0%100%
Low · 0.00 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. 16-07-2019
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability was discovered in DNS resolver of knot resolver before version 4.1.0 which allows remote attackers to downgrade DNSSEC-secure domains to DNSSEC-insecure state, opening possibility of domain hijack using attacks against insecure DNS protocol.

CVSS metrics

7 scores · 4 sources · 3 versions

EPSS trend

Probability

1.93%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.93% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.93%

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

Cz.nic1 product
Debian1 product
  • knot-resolver< 5.0.1-1
Fedoraproject1 product
Nic1 product
Ubuntu1 product
  • knot-resolverAll versions (No fix recorded) | < 3.2.1-3ubuntu2.2

5 vendors · 5 products

References

9 links