CVE-2021-42852

Authenticated command execution via crafted network packet

Published May 18, 2022 · Updated Aug 4, 2024

Command injection in Lenovo Personal Cloud Storage firmware allows remote authenticated users to execute OS commands via a crafted packet. Lenovo has not disclosed the packet-processing component or how attacker-controlled packet data reaches an operating system command interpreter. The attack requires an authenticated account and local-network reachability, and successful exploitation grants command execution on the storage appliance.

CVSS severity8.0
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Lenovo Personal Cloud Storage firmware allows remote authenticated users to execute OS commands via a crafted packet. Lenovo has not disclosed the packet-processing component or how attacker-controlled packet data reaches an operating system command interpreter. The attack requires an authenticated account and local-network reachability, and successful exploitation grants command execution on the storage appliance.

The record

CVE
CVE-2021-42852
Published
May 18, 2022
Updated
Aug 4, 2024
Vendor
Lenovo
Product
Personal Cloud Storage T2
Classifications
CWE-78, T1059
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. May 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <5.3.8.t2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Lenovo · Personal Cloud Storage T2version=unspecified <5.3.8.t2
Lenovo · Personal Cloud Storage A1version=unspecified <5.3.6.a1
Lenovo · Personal Cloud Storage T1version=unspecified <5.3.6.t1
Lenovo · Personal Cloud Storage X1version=unspecified <5.3.8.x1
Lenovo · Personal Cloud Storage T2Proversion=unspecified <5.3.7.t2-pro

Published CVSS scores

7.7NIST National Vulnerability DatabaseAV:A/AC:L/Au:S/C:C/I:C/A:C
8.0Lenovo Group Ltd.CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

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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