CVE-2022-4126

System takeover via persistent default login credentials

Published Mar 27, 2023 · Updated Feb 19, 2025

Use of a default password in ABB RCCMD before 4.40 230207 allows remote attackers with system-network access to take control. The access-control mechanism accepts the password proposed during installation without an effective safeguard against continued default use. Access to the system network is required; successful authentication permits arbitrary code execution and can stop the affected system node.

CVSS severity9.6
Critical
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use of a default password in ABB RCCMD before 4.40 230207 allows remote attackers with system-network access to take control. The access-control mechanism accepts the password proposed during installation without an effective safeguard against continued default use. Access to the system network is required; successful authentication permits arbitrary code execution and can stop the affected system node.

The record

CVE
CVE-2022-4126
Published
Mar 27, 2023
Updated
Feb 19, 2025
Vendor
GENEREX SYSTEMS Computervertriebsgesellschaft mbH
Product
RCCMD
Classifications
CWE-1393, CAPEC-70, T1078.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <4.40 230207

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

GENEREX SYSTEMS Computervertriebsgesellschaft mbH · RCCMDversion=0 <4.40 230207

Published CVSS scores

8.9ABBCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C
9.6ABBCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1393Use of Default Password
CAPEC-70Try Common or Default Usernames and Passwords
T1078.001Valid Accounts: Default Accounts

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo