Is CVE-2022-2928 being actively exploited?

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

What products does CVE-2022-2928 affect?

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

How do I fix CVE-2022-2928?

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

CVE-2022-2928

Q: What is CVE-2022-2928?

CVE-2022-2928 is a medium-severity software vulnerability (CWE-476) with a CVSS score of 6.5. In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_deref

MEDIUM severity · CVSS 6.5 · CWE-476

6.5CVSS MEDIUM

Summary

In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.

Impact & exploitability

Attack vectorAdjacent

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)1%

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

Affected products we track (1)

ISC DHCP

Recommendation

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

CVE-2022-2928

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information