CVE-2012-6068: The Runtime Toolkit in CODESYS Runtime System 2.3.x and 2.4.x does not require authentication, which allows re

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2012-6068 is a critical-severity flaw (CVSS 9.8) affecting codesys runtime system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Runtime Toolkit in CODESYS Runtime System 2.3.x and 2.4.x does not require authentication, which allows remote attackers to execute commands via the command-line interface in the TCP listener service or transfer files via requests to the TCP listener service.

Why this priority

Critical severity
EPSS top 7%: very likely to be exploited
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	5.3% (top 7%)
CISA exploited list	No
Weakness	CWE-284, CWE-264
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: 2.3.9.8 · 2.3.9.35 · 2.3.9.36 · 2.3.9.37 · 2.4.0

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-2012-6068?

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

Is CVE-2012-6068 being exploited?

CVE-2012-6068 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-2012-6068 affect?

CVE-2012-6068 affects codesys runtime system. Severity is critical (CVSS 9.8). The Runtime Toolkit in CODESYS Runtime System 2.3.x and 2.4.x does not require authentication, which allows remote attackers to execute commands via the command-line interface in the TCP listener service or transfer files via requests to th

How urgent is CVE-2012-6068?

Priority 62/100. Critical severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action

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References

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