How severe is CVE-2021-42850?

CVE-2021-42850 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-42850 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42850?

CVE-2021-42850 primarily affects Lenovo A1 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-42850?

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-2021-42850 published?

CVE-2021-42850 was published on 2022-05-18 and last updated on 2026-06-17.

CVE-2021-42850

CVE-2021-42850 is a high-severity vulnerability in Lenovo A1 Firmware 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-798.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Lenovo A1 Firmware
Published: 2022-05-18
Last modified: 2026-06-17

Description

A weak default administrator password for the web interface and serial port was reported in some Lenovo Personal Cloud Storage devices that could allow unauthorized device access to an attacker with physical or local network access.

Frequently asked questions

What is CVE-2021-42850?: A weak default administrator password for the web interface and serial port was reported in some Lenovo Personal Cloud Storage devices that could allow unauthorized device access to an attacker with physical or local network access.
How severe is CVE-2021-42850?: CVE-2021-42850 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-42850 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42850?: CVE-2021-42850 primarily affects Lenovo A1 Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-42850?: 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-2021-42850 published?: CVE-2021-42850 was published on 2022-05-18 and last updated on 2026-06-17.

References

https://iknow.lenovo.com.cn/detail/dc_200017.html

Affected products (5)

cpe:2.3:o:lenovo:a1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:t1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:x1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:t2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:t2pro_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Lenovo A1 Firmware

CVE-2021-42852 — High (CVSS 8.0): A command injection vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an…
CVE-2021-42849 — Medium (CVSS 6.8): A weak default password for the serial port was reported in some Lenovo Personal Cloud Storage devices that could allow…
CVE-2021-42851 — Medium (CVSS 6.3): A vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an unauthenticated user to…
CVE-2021-42848 — Medium (CVSS 4.3): An information disclosure vulnerability was reported in some Lenovo Personal Cloud Storage devices that could allow an…

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