SARA / Free Tools / CVE / CVE-2019-10190

CVE-2019-10190 — A vulnerability was discovered in DNS resolver component of knot resolver throug

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 fa

CVSS
5.4 MEDIUM
EPSS
0.26% (top 50.70%)
CWE
CWE-20
Published
2019-07-16T17:50:05.000Z
Last modified
2025-02-13T16:27:20.781Z
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

01What is this vulnerability?

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.

02Affected products

VendorProductVersions
CZ.NICknotresolver — from 3.2.0 before 4.1.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

CVE-2019-10191
Cited in vendor advisory

08Timeline

09References

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