Security readout for executives and security teams
Plain-English summary
This flaw affects specific Realtek USB network adapter drivers. A nearby network attacker, according to the advisory description, may be able to crash or disrupt affected systems or network service availability. The source bundle does not show data theft, privilege escalation, or active exploitation evidence.
Executive priority
Treat as a moderate availability risk. Prioritize remediation for business-critical endpoints, exposed LAN environments, and operational systems where a network adapter crash would interrupt service or field operations.
Technical view
CVE-2022-21742 is a CWE-120 buffer overflow in Realtek USB FE/1GbE/2.5GbE/5GbE NIC Family drivers caused by insufficient parameter length verification in an API function. CVSS is 6.2 with availability impact only. Note the bundle description mentions LAN attackers while the vector lists AV:L.
Likely exposure
Exposure is likely limited to systems using the affected Realtek USB NIC driver family versions 10.28, 8.49, or 7.42. Risk is higher where USB Ethernet adapters are used on workstations, kiosks, appliances, or operational hosts on untrusted LANs.
Exploitation context
The bundle does not cite CISA KEV listing or any confirmed exploitation in the wild. The stated attacker model is unauthenticated LAN disruption, but no exploit maturity, proof-of-concept, or weaponization evidence is provided.
Researcher notes
Available evidence identifies the vulnerable family, affected versions, CWE, and availability impact, but does not name a fixed version or detailed root-cause behavior beyond parameter length verification. Avoid broad assumptions about other Realtek products without vendor confirmation.
Mitigation direction
- Inventory systems using Realtek USB FE/1GbE/2.5GbE/5GbE NIC drivers.
- Check Realtek and TWCERT guidance for fixed driver versions.
- Upgrade or replace affected drivers when vendor-approved updates are available.
- Limit untrusted LAN access to systems using affected USB network adapters.
- Monitor affected hosts for unexplained network driver crashes or service disruption.
Validation and detection
- Confirm whether driver versions 10.28, 8.49, or 7.42 are deployed.
- Verify adapter hardware belongs to the affected Realtek USB NIC family.
- Compare installed drivers against current Realtek or OS vendor packages.
- Review endpoint crash logs for Realtek USB network driver failures.
- Document systems where no vendor fix is identified yet.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-120: Exact CWE lookup
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Open ATT&CK lookupCVE-2022-21742 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.twcert.org.tw/tw/cp-132-6057-1cd0d-1.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.