CVE-2023-43699Network attack vector

Password guessing via unlimited login attempts

Published Oct 9, 2023 · Updated Dec 9, 2024

Improper login-attempt restriction in SICK APU0200 all versions allows remote attackers to guess passwords through repeated logins. The RDT400 authentication path accepts trial-and-error login requests without limiting failed attempts or imposing a lockout. Network access to the login interface is sufficient; success grants the same access as the compromised account, with no reported integrity or availability impact.

CVSS severity7.5
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper login-attempt restriction in SICK APU0200 all versions allows remote attackers to guess passwords through repeated logins. The RDT400 authentication path accepts trial-and-error login requests without limiting failed attempts or imposing a lockout. Network access to the login interface is sufficient; success grants the same access as the compromised account, with no reported integrity or availability impact.

The record

CVE
CVE-2023-43699
Published
Oct 9, 2023
Updated
Dec 9, 2024
Vendor
SICK AG
Product
SICK APU0200
Classifications
CWE-307, CAPEC-49, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 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=0 <=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SICK AG · SICK APU0200version=0 <=*
SICK AG · APU0200version=all versions

Published CVSS scores

7.5SICK AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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-307Improper Restriction of Excessive Authentication Attempts
CAPEC-49Password Brute Forcing
T1110.001Password Guessing

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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