CVE-2017-15105
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.
Does this matter?
Lower severity and a low EPSS score (3.16%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 3.16% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-358, CWE-20
- Affected
- nlnetlabs/unbound · debian/debian linux · canonical/ubuntu linux
- Source
- secalert@redhat.com
EPSS 3.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/102817Third Party Advisory, VDB Entry
- https://lists.debian.org/debian-lts-announce/2018/01/msg00039.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00022.htmlMailing List, Third Party Advisory
- https://unbound.net/downloads/CVE-2017-15105.txtPatch, Vendor Advisory
- https://usn.ubuntu.com/3673-1/Third Party Advisory
- http://www.securityfocus.com/bid/102817Third Party Advisory, VDB Entry
- https://lists.debian.org/debian-lts-announce/2018/01/msg00039.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00022.htmlMailing List, Third Party Advisory
- https://unbound.net/downloads/CVE-2017-15105.txtPatch, Vendor Advisory
- https://usn.ubuntu.com/3673-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.