TI-2019-07511 Aliases CVE-2019-10190 GHSA-5pqr-9wpj-5m82

Improper input validation in CZ.NIC knot-resolver

LOW 37CWE-20Published 2019-07-16 · Updated 2025-02-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which allows remote attackers to bypass DNSSEC validation for non-existence answer. NXDOMAIN answer would get passed through to the client even if its DNSSEC validation failed, instead of sending a SERVFAIL packet. Caching is not affected by this particular bug but see CVE-2019-10191.

Why it matters now

EPSS 0.01993 80th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
CZ.NIC	knot-resolver	from 3.2.0 before 4.1.0	—	No fix listed	CNA

knot-resolver VendorCZ.NIC Affected from 3.2.0 before 4.1.0 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:nic:knot_resolver::::::::	up to 3.2.0; 4.0.0 to before 4.1.0	Vulnerable	CZ.NIC
cpe:2.3:o:fedoraproject:fedora:29:::::::*	29	Vulnerable	Fedoraproject
cpe:2.3:o:fedoraproject:fedora:30:::::::*	30	Vulnerable	Fedoraproject

cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:* Versions up to 3.2.0; 4.0.0 to before 4.1.0 Vulnerable ·CZ.NIC
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:* Versions 29 Vulnerable ·Fedoraproject
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2019-07-16
CZ.NIC knot-resolver — FEDORA-2019-20f95b0b39
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2019-07512 Improper input validation in CZ.NIC knot-resolverPriority LOW 37
Show all 2 records → Advisory →
Advisory · 2019-07-16
CZ.NIC knot-resolver — FEDORA-2019-fdb50c675d
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2019-07512 Improper input validation in CZ.NIC knot-resolverPriority LOW 37
Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2019-10190
2026-10-03 Alias added: GHSA-5pqr-9wpj-5m82

References

Advisory 4

Other 1

https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html

TI-2023-27571 Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related… CVSS 3.1HIGH 7.5
TI-2020-10072 Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an… CVSS 3.1HIGH 7.5
TI-2022-19055 Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU… CVSS 3.1HIGH 7.5
TI-2023-24930 Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers. CVSS 3.1HIGH 7.5
TI-2023-11416 Knot Resolver before 5.6.0 enables attackers to consume its resources, launching… CVSS 3.1HIGH 7.5
TI-2019-13943 knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU… CVSS 3.1HIGH 7.5

See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences