CVE-2025-4003

Boot interruption via unchecked block pointer

Published Apr 28, 2025 · Updated Apr 28, 2025

NULL pointer dereference in RefindPlus 0.14.2.AB allows local users to crash the UEFI boot manager while it reads APFS extents. In ApfsReadJumpStart, InternalApfsTranslateBlock can return NULL for an APFS extent, but the caller immediately invokes BlockIo->ReadBlocks and reads BlockIo->Media without validating the pointer. Exploitation requires local low-privileged access to the boot environment and interrupts availability by crashing the pre-boot process; no data disclosure or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in RefindPlus 0.14.2.AB allows local users to crash the UEFI boot manager while it reads APFS extents. In ApfsReadJumpStart, InternalApfsTranslateBlock can return NULL for an APFS extent, but the caller immediately invokes BlockIo->ReadBlocks and reads BlockIo->Media without validating the pointer. Exploitation requires local low-privileged access to the boot environment and interrupts availability by crashing the pre-boot process; no data disclosure or modification is reported.

The record

CVE
CVE-2025-4003
Published
Apr 28, 2025
Updated
Apr 28, 2025
Vendor
RefindPlusRepo
Product
RefindPlus
Classifications
CWE-404, CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.14.2.AB

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

RefindPlusRepo · RefindPlusversion=0.14.2.AB

Published CVSS scores

5.5VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6VulDBAV:L/AC:L/Au:S/C:N/I:N/A:C
6.8VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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