CVE-2025-66678: An issue in the HwRwDrv.sys component of Nil Hardware Editor Hardware Read & Write Utility v1.25.11.26 and ear

Q: How do I fix CVE-2025-66678?

hardware read \& write utility: upgrade to newer than 1.25.11.26. Exact commands for each OS are on this page.

Q: Is CVE-2025-66678 being exploited?

CVE-2025-66678 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-66678 affect?

CVE-2025-66678 affects hardware read \& write utility. Severity is critical (CVSS 9.8). An issue in the HwRwDrv.sys component of Nil Hardware Editor Hardware Read & Write Utility v1.25.11.26 and earlier allows attackers to execute arbitrary read and write operations via a crafted request.

Q: How urgent is CVE-2025-66678?

Priority 60/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-66678 is a critical-severity flaw (CVSS 9.8) affecting hardware read \& write utility. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in the HwRwDrv.sys component of Nil Hardware Editor Hardware Read & Write Utility v1.25.11.26 and earlier allows attackers to execute arbitrary read and write operations via a crafted request.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-03-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: faintsnow

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-04 17:16 UTCPublished CVE record published
2026-06-17 09:57 UTCUpdated Record last modified

faintsnow hardware read \& write utility UPGRADE

Affected: <= 1.25.11.26

Fixed in: newer than 1.25.11.26

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hardware-read--write-utility || rpm -q hardware-read--write-utility || hardware-read--write-utility --version

2. UPGRADE to newer than 1.25.11.26 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hardware-read--write-utility

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hardware-read--write-utility

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · proftpd · FIXED · 1.3.9e-2.fc46 · FEDORA-2026-fcb0a25c2f · source

sudo dnf upgrade --advisory=FEDORA-2026-fcb0a25c2f

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: cwjchoi01/CVE-2025-66678 (2 stars)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-66678?

hardware read \& write utility: upgrade to newer than 1.25.11.26. Exact commands for each OS are on this page.

Is CVE-2025-66678 being exploited?

CVE-2025-66678 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-66678 affect?

CVE-2025-66678 affects hardware read \& write utility. Severity is critical (CVSS 9.8). An issue in the HwRwDrv.sys component of Nil Hardware Editor Hardware Read & Write Utility v1.25.11.26 and earlier allows attackers to execute arbitrary read and write operations via a crafted request.

How urgent is CVE-2025-66678?

Priority 60/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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