Is CVE-2021-42849 in the CISA KEV catalog?

No. CVE-2021-42849 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42849?

CVE-2021-42849 has a CVSS v3 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2021-42849?

CVE-2021-42849 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42849?

Upgrade a1 firmware to 5.3.6.a1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-42849

MEDIUM

6.8

CVSS v3

NVD

Description

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

CWE-798Hard-coded Credentials CWE-287Improper Authentication

How to fix

Remediation Available

a1 firmwareNVD

Affected:< 5.3.6.a1Fixed in:5.3.6.a1CVE-2021-42849derived from NVD

t1 firmwareNVD

Affected:< 5.3.6.t1Fixed in:5.3.6.t1CVE-2021-42849derived from NVD

t2 firmwareNVD

Affected:< 5.3.8.t2Fixed in:5.3.8.t2CVE-2021-42849derived from NVD

t2pro firmwareNVD

Affected:< 5.3.7.t2-proFixed in:5.3.7.t2-proCVE-2021-42849derived from NVD

x1 firmwareNVD

Affected:< 5.3.8.x1Fixed in:5.3.8.x1CVE-2021-42849derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Vendor Advisory1

iknow.lenovo.com.cn

Related Vulnerabilities

Other CWE-798 (Hard-coded Credentials) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-26138	Critical	9.8	98%	KEV	-
CVE-2024-3272	Critical	9.8	98%	KEV	-
CVE-2025-30406	Critical	9.0	94%	KEV	Fix
CVE-2024-28987	Critical	9.1	93%	KEV	Fix
CVE-2019-15976	Critical	9.8	93%	-	Fix
CVE-2024-20439	Critical	9.8	92%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.