CVE-2021-3723Network attack vector

Authenticated command execution via IMM command injection

Published Nov 12, 2021 · Updated Aug 3, 2024

Command injection in the IMM of IBM System x3550 M3 and IBM System x3650 M3 allows remote authenticated users to execute OS commands. Lenovo has not published the affected IMM command or the input-processing operation that fails to neutralize command syntax. Exploitation requires a valid SSH or Telnet session and grants command execution within the embedded management environment.

CVSS severity8.8
High
EPSS probability1.94%
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 the IMM of IBM System x3550 M3 and IBM System x3650 M3 allows remote authenticated users to execute OS commands. Lenovo has not published the affected IMM command or the input-processing operation that fails to neutralize command syntax. Exploitation requires a valid SSH or Telnet session and grants command execution within the embedded management environment.

The record

CVE
CVE-2021-3723
Published
Nov 12, 2021
Updated
Aug 3, 2024
Vendor
IBM
Product
IBM System x3650 M3
Classifications
CWE-78, T1059.008
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=all

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM System x3650 M3version=all
IBM · IBM System x3550 M3version=all

Published CVSS scores

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
7.2Lenovo Group Ltd.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.008Network Device CLI

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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