Vulnerability Database

328,407

Total vulnerabilities in the database

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.

  • Published: Feb 15, 2024
  • Updated: Nov 16, 2025
  • CVE: CVE-2022-23087
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.8
  • AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CWEs:

Software From Fixed in
freebsd / freebsd 13.0-rc5 13.0-rc5.x
freebsd / freebsd 13.0-rc1 13.0-rc1.x
freebsd / freebsd 13.0-rc2 13.0-rc2.x
freebsd / freebsd 13.0-rc4 13.0-rc4.x
freebsd / freebsd 13.0-beta1 13.0-beta1.x
freebsd / freebsd 13.0-beta2 13.0-beta2.x
freebsd / freebsd 12.3-p1 12.3-p1.x
freebsd / freebsd 13.0 13.0.x
freebsd / freebsd 13.0-beta3 13.0-beta3.x
freebsd / freebsd 13.0-beta3-p1 13.0-beta3-p1.x
freebsd / freebsd 13.0-beta4 13.0-beta4.x
freebsd / freebsd 13.0-p1 13.0-p1.x
freebsd / freebsd 13.0-p2 13.0-p2.x
freebsd / freebsd 13.0-p3 13.0-p3.x
freebsd / freebsd 13.0-p4 13.0-p4.x
freebsd / freebsd 13.0-p5 13.0-p5.x
freebsd / freebsd 13.0-rc3 13.0-rc3.x
freebsd / freebsd 13.0-rc5-p1 13.0-rc5-p1.x
freebsd / freebsd 12.0 12.3
freebsd / freebsd 12.3 12.3.x
freebsd / freebsd 12.3-p2 12.3-p2.x
freebsd / freebsd 12.3-p3 12.3-p3.x
freebsd / freebsd 12.3-p4 12.3-p4.x
freebsd / freebsd 13.0-p10 13.0-p10.x
freebsd / freebsd 13.0-p6 13.0-p6.x
freebsd / freebsd 13.0-p7 13.0-p7.x
freebsd / freebsd 13.0-p8 13.0-p8.x
freebsd / freebsd 13.0-p9 13.0-p9.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.