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Fencer Vulns
medium 5.3

CVE-2017-15105 json

A flaw was found in the way unbound before 1.6.8 validated wildcard-synthesized NSEC records.

published 2018-01-23 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-6570

cvss
5.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

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.

Patch / fix

  • nlnetlabs unbound 1.6.8
  • unbound Debian 14, Debian 13, Debian 12 1.7.1-1

debian advisories DEBIAN-CVE-2017-15105

  • unbound Ubuntu 14.04 LTS 1.4.22-1ubuntu4.14.04.3
  • unbound Ubuntu 16.04 LTS 1.5.8-1ubuntu1.1
  • unbound Ubuntu 18.04 LTS 1.6.7-1ubuntu2.1

ubuntu advisories UBUNTU-CVE-2017-15105

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • unbound openSUSE Tumbleweed 1.13.2-1.2

opensuse advisories openSUSE-SU-2024:11005-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-15105 updated cvss 5.4

unbound: Improper validation of wildcard synthesized NSEC records

  • Red Hat Enterprise Linux 7 unbound, unbound-libs, unbound-python
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 unbound, unbound-libs, unbound-python Red Hat Enterprise Linux 8 unbound, unbound-libs, python3-unbound
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.16% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

  • NLnet Labs unbound

Classification

Weakness
  • CWE-358 Improperly Implemented Security Check for Standard
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.