How severe is CVE-2021-42987?

CVE-2021-42987 has a CVSS 3.x base score of 8.8, 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-2021-42987 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42987?

CVE-2021-42987 affects Eltima Usb Network Gate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42987?

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-2021-42987 published?

CVE-2021-42987 was published on 2021-12-07 and last updated on 2026-06-17.

CVE-2021-42987

CVE-2021-42987 is a high-severity vulnerability in Eltima Usb Network Gate with a CVSS 3.x base score of 8.8. 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-190.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Eltima Usb Network Gate
Published: 2021-12-07
Last modified: 2026-06-17

Description

Eltima USB Network Gate is affected by Integer Overflow. IOCTL Handler 0x22001B in the USB Network Gate above 7.0.1370 below 9.2.2420 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet.

Frequently asked questions

What is CVE-2021-42987?: Eltima USB Network Gate is affected by Integer Overflow. IOCTL Handler 0x22001B in the USB Network Gate above 7.0.1370 below 9.2.2420 allow local attackers to execute arbitrary code in kernel mode or cause a denial of service (memory corruption and OS crash) via specially crafted I/O Request Packet.
How severe is CVE-2021-42987?: CVE-2021-42987 has a CVSS 3.x base score of 8.8, 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-2021-42987 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42987?: CVE-2021-42987 affects Eltima Usb Network Gate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42987?: 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-2021-42987 published?: CVE-2021-42987 was published on 2021-12-07 and last updated on 2026-06-17.

References

https://www.sentinelone.com/labs/usb-over-ethernet-multiple-privilege-escalation-vulnerabilities-in-aws-and-other-major-cloud-services/

Affected products (1)

cpe:2.3:a:eltima:usb_network_gate:*:*:*:*:*:*:*:*

More vulnerabilities in Eltima Usb Network Gate

CVE-2021-42988 — High (CVSS 8.8): Eltima USB Network Gate is affected by Buffer Overflow. IOCTL Handler 0x22001B in the USB Network Gate above 7.0.1370…

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