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CVE-2022-30698

23
FAUCET Score

CVE-2022-30698 affects NLnet Labs Unbound versions up to 1.16.1, including Fedora distributions. It describes a "ghost domain names" attack where a malicious nameserver can continuously update Unbound's delegation cache for a rogue domain, keeping it resolvable long after revocation. Rated Medium (CVSS 6.5), this vulnerability has a low attack complexity and can lead to high confidentiality impact, but requires no user interaction or elevated privileges. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.16.2CPE matchmatch criteria
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
36CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
<= 1.16.1CPE match
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.87%
Probability of exploitation in next 30 days
EPSS Percentile
55.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0087 is in the 67th percentile among its peer group of 21,977 CVEs.

Social Chatter

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

Patch Available

Vendor Patches (7)

microsoftpatch availablevia msrc
Product: 18648-16823Fixed in: 1.16.2-1
microsoftpatch availablevia msrc
Product: cm1 unbound 1.10.0-5 on CBL Mariner 1.0Fixed in: 1.10.0-5
microsoftpatch availablevia msrc
Product: cbl2 unbound 1.16.2-1 on CBL Mariner 2.0Fixed in: 1.16.2-1
microsoftpatch availablevia msrc
Product: 18601-16820Fixed in: 1.10.0-5
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: unbound-0:1.16.2-2.el9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Extended Update SupportFixed in: unbound-0:1.7.3-17.el8_6.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: unbound-0:1.16.2-2.el8
View patch

Vendor Advisories (2)

microsoft2022-Aug/CVE-2022-30698Moderate

Novel "ghost domain names" attack by introducing subdomain delegations

Aug 9, 2022
redhatCVE-2022-30698Moderate

unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names

Aug 1, 2022

References

lists.debian.org / debian-lts-announce/2023/03/msg00024.html
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/5L3ZFWZZFPBIL654BG75RWXUMPFQJ5EC
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/D35CX4SCZVNKZTWJXPDFTHWZHINMGEZD
security.gentoo.org / glsa/202212-02
Third Party Advisory
nlnetlabs.nl / downloads/unbound/CVE-2022-30698_CVE-2022-30699.txt
Vendor Advisory