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CVE-2017-15105

21
FAUCET Score

CVE-2017-15105 describes a flaw in Unbound versions prior to 1.6.8, where improper validation of wildcard-synthesized NSEC records could lead to incorrect non-existence proofs for existing wildcard records or acceptance of invalid NODATA proofs. This vulnerability affects various distributions of Unbound, including those from Canonical, Debian, and NLnet Labs. Rated as Medium severity (CVSS 5.3), this vulnerability is network-exploitable with low attack complexity and no user interaction required, potentially leading to a low impact on integrity by providing incorrect DNS resolution. There is no evidence of active exploitation, and no public exploit code (Metasploit, Nuclei, ExploitDB) or significant community discussion or media coverage has been observed for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.8CPE matchmatch criteria
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.63%
Probability of exploitation in next 30 days
EPSS Percentile
83.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0263 is in the 76th percentile among its peer group of 23,723 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: unbound

Vendor Advisories (1)

redhatCVE-2017-15105Moderate

unbound: Improper validation of wildcard synthesized NSEC records

Jan 19, 2018

References

lists.debian.org / debian-lts-announce/2018/01/msg00039.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2019/02/msg00022.html
Mailing ListThird Party Advisory
unbound.net / downloads/CVE-2017-15105.txt
PatchVendor Advisory
usn.ubuntu.com / 3673-1
Third Party Advisory
securityfocus.com / bid/102817
Third Party AdvisoryVDB Entry