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TI-2022-12835 Aliases CVE-2022-30699GHSA-fjfh-84xh-5hv3

Novel "ghost domain names" attack by updating almost expired delegation information

Priority LOW 31CWE-613Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 4 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-613.

Summary

NLnet Labs Unbound, up to and including version 1.16.1, is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From version 1.16.2 on, Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten.

Why it matters now

EPSS 0.01155 67th percentileScored 2026-11-07
Fix Partial Red Hat: 3 advisoriesRed Hat: 4 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
NLnet LabsUnboundup to 1.16.1—No fix listedCNA
  • Unbound VendorNLnet Labs Affected up to 1.16.1 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*before 1.16.2VulnerableNLNETLABS
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*35VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*36VulnerableFedoraproject
  • cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* Versions before 1.16.2 Vulnerable ·NLNETLABS
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject

Remediation

Red Hat 3 advisories

  • RHSA-2024:2045 Released 2024-04-25 · Red Hat rating Moderate
    unbound security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) python3-unbound-1.7.3-17.el8_6.5, unbound-1.7.3-17.el8_6.5, unbound-devel-1.7.3-17.el8_6.5 +1
  • RHSA-2022:8062 Released 2022-11-15 · Red Hat rating Moderate
    unbound security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 9) unbound-devel-1.16.2-2.el9
    • Red Hat Enterprise Linux AppStream (v. 9) python3-unbound-1.16.2-2.el9, unbound-1.16.2-2.el9, unbound-libs-1.16.2-2.el9
  • RHSA-2022:7622 Released 2022-11-08 · Red Hat rating Moderate
    unbound security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) python3-unbound-1.16.2-2.el8, unbound-1.16.2-2.el8, unbound-devel-1.16.2-2.el8 +1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    NLnet Labs Unbound — FEDORA-2022-f89beb0640

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2022-12834 Novel "ghost domain names" attack by introducing subdomain delegationsPriority LOW 31
    Show all 2 records → Advisory →
  • Advisory ·

    NLnet Labs Unbound — FEDORA-2022-0a914d5c6b

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2022-12834 Novel "ghost domain names" attack by introducing subdomain delegationsPriority LOW 31
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 9)Fixed RHSA-2022:8062
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:7622
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2022:8062
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2024:2045

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-30699
  2. 2026-10-03 Alias added: GHSA-fjfh-84xh-5hv3

References

Advisory 4

Other 1

  • TI-2026-25690 Possible arbitrary code execution during DNSSEC validation CVSS 4.0CRITICAL 9.1
  • TI-2026-56302 Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY CVSS 4.0CRITICAL 9.1
  • TI-2026-31146 Crash during DNSSEC validation of malicious content CVSS 4.0HIGH 8.7
  • TI-2026-31135 Heap overflow with multiple NSID, COOKIE, PADDING EDNS options CVSS 4.0HIGH 8.7
  • TI-2026-36436 Routinator crashes on specifically crafted RRDP XML files CVSS 4.0HIGH 8.7
  • TI-2026-36433 Routinator exits when accepting an incoming HTTP or RTR connection fails CVSS 4.0HIGH 8.7
See all 96 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences