CVE-2023-3669

Protected-project disclosure via unlimited import password guesses

Published Aug 3, 2023 · Updated Feb 27, 2025

Improper restriction of password attempts in CODESYS Development System before 3.5.19.20 allows local users to access protected imports. The import dialog permits unlimited password guesses because it applies no brute-force limit to repeated failures. Local workstation access and a password-protected import are required; a successful guess exposes the imported project's contents.

CVSS severity3.3
Low
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper restriction of password attempts in CODESYS Development System before 3.5.19.20 allows local users to access protected imports. The import dialog permits unlimited password guesses because it applies no brute-force limit to repeated failures. Local workstation access and a password-protected import are required; a successful guess exposes the imported project's contents.

The record

CVE
CVE-2023-3669
Published
Aug 3, 2023
Updated
Feb 27, 2025
Vendor
CODESYS GmbH
Product
CODESYS Development System
Classifications
CWE-307, T1110
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record 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=3.0.0.0 <3.5.19.20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

CODESYS GmbH · CODESYS Development Systemversion=3.0.0.0 <3.5.19.20

Published CVSS scores

3.3CERT VDECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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