What is CVE-2022-23087?

CVE-2022-23087 is a high-severity vulnerability in FreeBSD, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2024-02-15.

How severe is CVE-2022-23087?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2022-23087 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in FreeBSD

CVE-2022-23087

The e1000 network adapters permit a variety of modifications to an Ethernet packet when it is being transmitted. These include the insertion of IP and TCP checksums, insertion of an Ethernet VLAN header, and TCP segmentation offload ("TSO"). The e1000 device model uses an on-stack buffer to generate the modified packet header when simulating these modifications on transmitted packets. When checksum offload is requested for a transmitted packet, the e1000 device model used a guest-provided value to specify the checksum offset in the on-stack buffer. The offset was not validated for certain packet types. A misbehaving bhyve guest could overwrite memory in the bhyve process on the host, possibly leading to code execution in the host context. The bhyve process runs in a Capsicum sandbox, which (depending on the FreeBSD version and bhyve configuration) limits the impact of exploiting this issue.

Vulnerability class: Buffer Overflow

Published 2024-02-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (9.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

FreeBSD — versions 13.1-RC1, 12.3-RELEASE, 13.0-RELEASE

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

security.freebsd.org/advisories/FreeBSD-SA-22:05.bhyve.asc (vendor-advisory, Vendor Advisory)
security.netapp.com/advisory/ntap-20240415-0005/ (Third Party Advisory)

Frequently asked questions

What is CVE-2022-23087?: CVE-2022-23087 is a high-severity vulnerability in FreeBSD, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2024-02-15.
How severe is CVE-2022-23087?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2022-23087 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.