# CVE-2019-10190: knot-resolver: A vulnerability was discovered in DNS resolver component of knot resolver through version 3.2.0 before 4.1.0 which al...

CVE-2019-10190 is fixed in 2 products on 1 platform, first by knot-resolver 3.2.1-3ubuntu2.2, released May 19, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-10190
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0199
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 10, 2019

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | knot-resolver Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu2.2 | [knot-resolver 3.2.1-3ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-knot-resolver-3.2.1-3ubuntu2.2.md) | May 19, 2020 |
| Linux | knot-resolver-module-http Ubuntu 20.04 LTS (focal) | 3.2.1-3ubuntu2.2 | [knot-resolver-module-http 3.2.1-3ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-knot-resolver-module-http-3.2.1-3ubuntu2.2.md) | May 19, 2020 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo