CVE-2025-1468Public exploitNetwork attack vector

Authentication bypass via RSA padding oracle

Published Mar 18, 2025 · Updated Mar 18, 2025

Observable timing discrepancy in CODESYS Runtime Toolkit before 3.5.21.0 allows remote attackers to recover OPC UA server secrets. CmpOPCUAServer processes PKCS#1 v1.5-encrypted OpenSecureChannel payloads under Basic128Rsa15 and exposes a Bleichenbacher padding oracle through response timing. The policy is disabled by default and requires the CMPOPCUASTACK_ALLOW_SHA1_BASED_SECURITY build flag; exposure permits private-key compromise, authentication bypass, or traffic decryption.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Observable timing discrepancy in CODESYS Runtime Toolkit before 3.5.21.0 allows remote attackers to recover OPC UA server secrets. CmpOPCUAServer processes PKCS#1 v1.5-encrypted OpenSecureChannel payloads under Basic128Rsa15 and exposes a Bleichenbacher padding oracle through response timing. The policy is disabled by default and requires the CMPOPCUASTACK_ALLOW_SHA1_BASED_SECURITY build flag; exposure permits private-key compromise, authentication bypass, or traffic decryption.

The record

CVE
CVE-2025-1468
Published
Mar 18, 2025
Updated
Mar 18, 2025
Vendor
CODESYS GmbH
Product
CODESYS Runtime Toolkit
Classifications
CWE-203, CWE-208, T0819
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 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=0 <3.5.21.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CODESYS GmbH · CODESYS Runtime Toolkitversion=0 <3.5.21.0

Published CVSS scores

7.5CERT VDECVSS: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 exploitPublished

Weakness, pattern, technique

CWE-203Observable Discrepancy
CWE-208Observable Timing Discrepancy
T0819Exploit Public-Facing Application

Public exploit references

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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