CVE-2022-2302Network attack vector

Unauthenticated OPC UA access via skipped password verification

Published Jul 11, 2022 · Updated Sep 16, 2024

Authentication bypass in affected Lenze c520, c550, and c750 firmware allows remote attackers unauthorized OPC UA access. The firmware interface to the embedded OPC UA server skips password verification on a client's second user/password login. The flaw is reachable only after an earlier login and when user management, the OPC UA server, and symbol-based data transfer are enabled.

CVSS severity9.8
Critical
EPSS probability2.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected Lenze c520, c550, and c750 firmware allows remote attackers unauthorized OPC UA access. The firmware interface to the embedded OPC UA server skips password verification on a client's second user/password login. The flaw is reachable only after an earlier login and when user management, the OPC UA server, and symbol-based data transfer are enabled.

The record

CVE
CVE-2022-2302
Published
Jul 11, 2022
Updated
Sep 16, 2024
Vendor
Lenze
Product
c520 controller
Classifications
CWE-287, CWE-304, T0819
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=V01.07.00.2757 <V01.08.01.3021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Lenze · c520 controllerversion=V01.07.00.2757 <V01.08.01.3021
Lenze · c750 controllerversion=V01.07.00.2757 <V01.08.01.3021
Lenze · c550 controllerversion=V01.07.00.2757 <V01.08.01.3021

Published CVSS scores

9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
9.8CERT@VDECVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-304Missing Critical Step in Authentication
T0819Exploit Public-Facing Application

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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