How severe is CVE-2018-5276?

CVE-2018-5276 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-5276 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5276?

CVE-2018-5276 affects Malwarebytes. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-5276?

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

When was CVE-2018-5276 published?

CVE-2018-5276 was published on 2018-01-08 and last updated on 2026-06-17.

CVE-2018-5276

CVE-2018-5276 is a high-severity vulnerability in Malwarebytes with a CVSS 3.x base score of 7.8. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.1
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Malwarebytes
Published: 2018-01-08
Last modified: 2026-06-17

Description

In Malwarebytes Premium 3.3.1.2183, the driver file (FARFLT.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x9c40e018. NOTE: the vendor reported that they "have not been able to reproduce the issue on any Windows operating system version (32-bit or 64-bit).

Frequently asked questions

What is CVE-2018-5276?: In Malwarebytes Premium 3.3.1.2183, the driver file (FARFLT.SYS) allows local users to cause a denial of service (BSOD) or possibly have unspecified other impact because of not validating input values from IOCtl 0x9c40e018. NOTE: the vendor reported that they "have not been able to reproduce the issue on any Windows operating system version (32-bit or 64-bit).
How severe is CVE-2018-5276?: CVE-2018-5276 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-5276 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5276?: CVE-2018-5276 affects Malwarebytes. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-5276?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-5276 published?: CVE-2018-5276 was published on 2018-01-08 and last updated on 2026-06-17.

References

https://github.com/ZhiyuanWang-Chengdu-Qihoo360/Malwarebytes_POC/tree/master/0x9c40e018

Affected products (1)

cpe:2.3:a:malwarebytes:malwarebytes:3.3.1.2183:*:*:*:premium:*:*:*

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