Security readout for executives and security teams
Plain-English summary
CVE-2022-28737 is a bootloader shim memory corruption issue. A crafted EFI executable could trigger out-of-bounds memory writes while shim loads it. The scenario requires local, highly privileged access and user interaction, but impact could include compromise of confidentiality, integrity, and availability during the boot chain.
Executive priority
Treat this as a moderate-priority boot chain risk. It is not remotely exploitable based on the supplied evidence, but affected secure boot infrastructure deserves prompt inventory and vendor-guided remediation because compromise at this layer can undermine system trust.
Technical view
The reported flaw is in shim handle_image(), which considers each section's SizeOfRawData when loading EFI executables. The source says crafted input can cause out-of-bound memory writes, and arbitrary code execution is not ruled out. CVSS 3.1 is 6.5 with local access, low complexity, high privileges, and user interaction required.
Likely exposure
Exposure is most likely on systems using the affected shim package in UEFI boot flows. The source names Red Hat Bootloader Team shim, but does not identify specific downstream distributions, package versions, or fixed releases. Confirm exposure against vendor advisories and installed shim package metadata.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation appears constrained by local access, high privileges, and user interaction, but the target is sensitive because shim participates in early boot and Secure Boot-related execution paths.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, affected shim package entry, and Openwall/MITRE references. No fix version, exploit proof, or downstream affected product list is provided in the bundle, so validation should avoid assumptions and rely on vendor-specific package advisories.
Mitigation direction
- Check vendor guidance for affected shim packages and fixed releases.
- Apply vendor-provided shim updates when available for your platform.
- Restrict administrative access to systems and boot configuration changes.
- Control physical access and unauthorized removable boot media.
- Review bootloader and firmware change-management procedures.
Validation and detection
- Inventory systems using shim in UEFI or Secure Boot boot paths.
- Compare installed shim packages against vendor CVE guidance.
- Confirm whether boot media and EFI executables are tightly controlled.
- Review asset records for affected bootloader package ownership.
- Track remediation status separately from operating system package updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2022-28737 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H0.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.openwall.com/lists/oss-security/2022/06/07/5CVE reference · mailing-list
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28737CVE reference · issue-tracking
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.