CVE-2012-6069: The CoDeSys Runtime Toolkit’s file transfer functionality does not perform input validation, which allows an

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CRITICAL 10.0REMOTEDOWNGRADE

CVE-2012-6069 is a critical-severity flaw (CVSS 10.0) affecting codesys runtime system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The CoDeSys Runtime Toolkit’s file transfer functionality does not perform input validation, which allows an attacker to access files and directories outside the intended scope. This may allow an attacker to upload and download any file on the device. This could allow the attacker to affect the availability, integrity, and confidentiality of the device.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 14%)
CISA exploited list	No
Weakness	CWE-23, CWE-22
Published	2013-01-21
Last modified	2026-06-16

Publisher (CNA): ICS-CERT · Vendor: 3s-software

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-01-21 21:55 UTCPublished CVE record published
2026-06-16 23:47 UTCUpdated Record last modified

3s-software codesys runtime system DOWNGRADE

Affected: 2.4.0 · 2.3.9.8 · 2.3.9.35 · 2.3.9.36 · 2.3.9.37

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.9.8

1. Check installed version

apt-cache policy codesys-runtime-system || rpm -q codesys-runtime-system || codesys-runtime-system --version

2. No fixed release: DOWNGRADE to a release before 2.3.9.8 (Debian / Ubuntu)

apt-cache madison codesys-runtime-system sudo apt install codesys-runtime-system=<VERSION_BEFORE_2.3.9.8> sudo apt-mark hold codesys-runtime-system

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list codesys-runtime-system sudo dnf downgrade codesys-runtime-system-<VERSION_BEFORE_2.3.9.8> sudo dnf versionlock add codesys-runtime-system

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-6069?

codesys runtime system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-6069 being exploited?

CVE-2012-6069 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-6069 affect?

CVE-2012-6069 affects codesys runtime system. Severity is critical (CVSS 10.0). The CoDeSys Runtime Toolkit’s file transfer functionality does not perform input validation, which allows an attacker to access files and directories outside the intended scope. This may allow an attacker to upload and download any file

How urgent is CVE-2012-6069?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

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References

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