Is CVE-2022-30699 being actively exploited?

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

What products does CVE-2022-30699 affect?

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

How do I fix CVE-2022-30699?

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

CVE-2022-30699

Q: What is CVE-2022-30699?

CVE-2022-30699 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 rogue domain name when the cached d

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 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.

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-2022-30699

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information