Is CVE-2022-30698 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 1%.

What products does CVE-2022-30698 affect?

Tracked products affected include Unbound. Check the version you run to see whether it is affected.

How do I fix CVE-2022-30698?

Apply the vendor fix in your normal patch cycle. Upgrade affected products to a fixed version.

CVE-2022-30698

Q: What is CVE-2022-30698?

CVE-2022-30698 is a medium-severity software vulnerability (CWE-613) with a CVSS score of 6.5. 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 subdomain of a rogue domain name. Th

MEDIUM severity · CVSS 6.5 · CWE-613

6.5CVSS MEDIUM

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 subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before expiry of the delegation information by querying Unbound for a second level subdomain which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation. From version 1.16.2 on, Unbound checks the validity of parent delegation records before using cached delegation information.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactNone

Availability impactNone

Exploit probability (EPSS)1%

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

Affected products we track (1)

Unbound

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

CVE-2022-30698

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information