CVE-2022-30698Network attack vector

Revoked-domain persistence via stale child delegations

Published Aug 1, 2022 · Updated Sep 16, 2024

Cache validation failure in NLnet Labs Unbound 1.16.1 and earlier allows remote attackers to keep revoked domains resolvable. The child-centric resolver accepts nested delegation data from a rogue nameserver without revalidating the parent delegation, allowing repeated queries to refresh child cache entries. Remote attackers must control a rogue domain and induce resolver queries; the bounded consequence is continued resolution after the parent delegation is revoked.

CVSS severity6.5
Medium
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cache validation failure in NLnet Labs Unbound 1.16.1 and earlier allows remote attackers to keep revoked domains resolvable. The child-centric resolver accepts nested delegation data from a rogue nameserver without revalidating the parent delegation, allowing repeated queries to refresh child cache entries. Remote attackers must control a rogue domain and induce resolver queries; the bounded consequence is continued resolution after the parent delegation is revoked.

The record

CVE
CVE-2022-30698
Published
Aug 1, 2022
Updated
Sep 16, 2024
Vendor
NLnet Labs
Product
Unbound
Classifications
CWE-613
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=1.16.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NLnet Labs · Unboundversion=unspecified <=1.16.1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo