# CVE-2017-15105: libunbound2: A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records

CVE-2017-15105 is fixed in 6 products on 1 platform, first by libunbound2 1.6.7-1ubuntu2.1, released January 22, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2017-15105
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0316
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 22, 2018

## Description

A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records. An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libunbound2 Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.1 | [libunbound2 1.6.7-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libunbound2-1.6.7-1ubuntu2.1.md) | Jan 22, 2018 |
| Linux | python-unbound Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.1 | [python-unbound 1.6.7-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-unbound-1.6.7-1ubuntu2.1.md) | Jan 22, 2018 |
| Linux | python3-unbound Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.1 | [python3-unbound 1.6.7-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-unbound-1.6.7-1ubuntu2.1.md) | Jan 22, 2018 |
| Linux | unbound Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.1 | [unbound 1.6.7-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-unbound-1.6.7-1ubuntu2.1.md) | Jan 22, 2018 |
| Linux | unbound-anchor Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.1 | [unbound-anchor 1.6.7-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-unbound-anchor-1.6.7-1ubuntu2.1.md) | Jan 22, 2018 |
| Linux | unbound-host Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.1 | [unbound-host 1.6.7-1ubuntu2.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-unbound-host-1.6.7-1ubuntu2.1.md) | Jan 22, 2018 |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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