CVE-2022-21742

Service interruption via unchecked API parameter length

Published Jun 20, 2022 · Updated Sep 17, 2024

Buffer overflow in Realtek USB NIC drivers for Windows allows remote attackers on the local network to interrupt service. An unspecified driver API function processes a supplied parameter without first verifying its length, allowing an oversized value to overrun a buffer. TWCERT reports an unauthenticated LAN path, while Realtek describes device access by an unprivileged local user that can trigger a system crash.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Realtek USB NIC drivers for Windows allows remote attackers on the local network to interrupt service. An unspecified driver API function processes a supplied parameter without first verifying its length, allowing an oversized value to overrun a buffer. TWCERT reports an unauthenticated LAN path, while Realtek describes device access by an unprivileged local user that can trigger a system crash.

The record

CVE
CVE-2022-21742
Published
Jun 20, 2022
Updated
Sep 17, 2024
Vendor
Realtek Semiconductor Corp.
Product
Realtek USB FE/1GbE/2.5GbE NIC Family
Classifications
CWE-120, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=10.28 <=10.39
  2. Affected versionversion=7.42 <=7.53
  3. Affected versionversion=8.49 <=8.60

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Realtek Semiconductor Corp. · Realtek USB FE/1GbE/2.5GbE NIC Familyversion=10.28 <=10.39; version=7.42 <=7.53; version=8.49 <=8.60

Published CVSS scores

6.5NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.2TWCERT/CCCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.3NVDAV:A/AC:L/Au:N/C:N/I:N/A:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Overflow
T1499.004Application or System Exploitation

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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