How severe is CVE-2025-66678?

CVE-2025-66678 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-66678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66678?

CVE-2025-66678 affects Faintsnow Hardware Read & Write Utility. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66678?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-66678 have an EU (EUVD) identifier?

Yes. CVE-2025-66678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208282.

When was CVE-2025-66678 published?

CVE-2025-66678 was published on 2026-03-04 and last updated on 2026-06-17.

CVE-2025-66678

CVE-2025-66678 is a critical-severity vulnerability in Faintsnow Hardware Read & Write Utility with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-208282
Weakness: CWE-89
Affected product: Faintsnow Hardware Read & Write Utility
Published: 2026-03-04
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-66678?: 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 severe is CVE-2025-66678?: CVE-2025-66678 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-66678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66678?: CVE-2025-66678 affects Faintsnow Hardware Read & Write Utility. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66678?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-66678 have an EU (EUVD) identifier?: Yes. CVE-2025-66678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208282.
When was CVE-2025-66678 published?: CVE-2025-66678 was published on 2026-03-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:faintsnow:hardware_read_\&_write_utility:*:*:*:*:*:*:*:*

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