CVE-2023-35841 | WinFlash Driver Permissions Issue

Exp

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.

Published: 2024-05-14 Last update: 2025-09-25 Assigner: 22d9ba52-f336-4b0d-bf1f-0efbdcc3c1de Source: 22d9ba52-f336-4b0d-bf1f-0efbdcc3c1de
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-35841 is rated Exploit Available (59.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.15%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-35841

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-35841

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-24 0.05% 0.15% +0.10%
2 2025-04-15 0.04% 0.05% +0.01%
3 2024-05-15 — 0.04% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-35841

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 22d9ba52-f336-4b0d-bf1f-0efbdcc3c1de

Weakness enumeration for CVE-2023-35841

Affected software / configurations for CVE-2023-35841

Vendor Product Version Raw CPE
phoenixtech winflash < 4.5.0.0 cpe:2.3:a:phoenixtech:winflash:*:*:*:*:*:windows:*:*

References for CVE-2023-35841

cvelogic Threat Intelligence