How severe is CVE-2022-21742?

CVE-2022-21742 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-21742 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-21742?

CVE-2022-21742 primarily affects Realtek Rtl8156 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-21742?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-21742 published?

CVE-2022-21742 was published on 2022-06-20 and last updated on 2026-06-17.

CVE-2022-21742

CVE-2022-21742 is a medium-severity vulnerability in Realtek Rtl8156 Firmware with a CVSS 3.x base score of 6.2. 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-120.

Key facts

Severity: Medium (CVSS 3.x base score 6.2)
CVSS v2: 3.3
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Realtek Rtl8156 Firmware
Published: 2022-06-20
Last modified: 2026-06-17

Description

Realtek USB driver has a buffer overflow vulnerability due to insufficient parameter length verification in the API function. An unauthenticated LAN attacker can exploit this vulnerability to disrupt services.

Frequently asked questions

What is CVE-2022-21742?: Realtek USB driver has a buffer overflow vulnerability due to insufficient parameter length verification in the API function. An unauthenticated LAN attacker can exploit this vulnerability to disrupt services.
How severe is CVE-2022-21742?: CVE-2022-21742 has a CVSS 3.x base score of 6.2, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-21742 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-21742?: CVE-2022-21742 primarily affects Realtek Rtl8156 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-21742?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-21742 published?: CVE-2022-21742 was published on 2022-06-20 and last updated on 2026-06-17.

References

https://www.twcert.org.tw/tw/cp-132-6057-1cd0d-1.html

Affected products (7)

cpe:2.3:o:realtek:rtl8156_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:realtek:rtl8156b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:realtek:rtl8153_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:realtek:rtl8153b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:realtek:rtl8154_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:realtek:rtl8154b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:realtek:rtl8152b_firmware:*:*:*:*:*:*:*:*

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