CVE-2012-4704: Array index error in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary co

Q: How do I fix CVE-2012-4704?

codesys gateway-server: upgrade to newer than 2.3.9.20. Exact commands for each OS are on this page.

Q: Is CVE-2012-4704 being exploited?

CVE-2012-4704 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-4704 affect?

CVE-2012-4704 affects codesys gateway-server. Severity is high (CVSS 10.0). Array index error in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary code via a crafted packet.

Q: How urgent is CVE-2012-4704?

Priority 58/100. Critical severity; EPSS top 9%: very likely to be exploited

This month

HIGH 10.0UPGRADE

CVE-2012-4704 is a high-severity flaw (CVSS 10.0) affecting codesys gateway-server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Array index error in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary code via a crafted packet.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Weakness	CWE-20
Published	2013-02-24
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

2013-02-24 11:48 UTCPublished CVE record published
2026-06-16 23:45 UTCUpdated Record last modified

3s-software codesys gateway-server UPGRADE

Affected: <= 2.3.9.20 · 2.3.5.1 · 2.3.5.2 · 2.3.5.3 · 2.3.6.0 · 2.3.7.0 · 2.3.8.0 · 2.3.8.1

Fixed in: newer than 2.3.9.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy codesys-gateway-server || rpm -q codesys-gateway-server || codesys-gateway-server --version

2. UPGRADE to newer than 2.3.9.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade codesys-gateway-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade codesys-gateway-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2012-4704?

codesys gateway-server: upgrade to newer than 2.3.9.20. Exact commands for each OS are on this page.

Is CVE-2012-4704 being exploited?

CVE-2012-4704 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-2012-4704 affect?

CVE-2012-4704 affects codesys gateway-server. Severity is high (CVSS 10.0). Array index error in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary code via a crafted packet.

How urgent is CVE-2012-4704?

Priority 58/100. Critical severity; EPSS top 9%: very likely to be exploited

Related CVEs

CVE-2013-2781 HIGH 10.0 DOWNGRADE Use-after-free vulnerability in the server application in 3S CODESYS Gateway 2.3.9.27 allows remote attackers
CVE-2012-4708 HIGH 10.0 UPGRADE Stack-based buffer overflow in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute ar
CVE-2012-4707 HIGH 10.0 UPGRADE 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary code via vectors that t
CVE-2012-4706 HIGH 7.8 UPGRADE Integer signedness error in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to cause a denia
CVE-2012-4705 HIGH 10.0 UPGRADE Directory traversal vulnerability in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to exec

References

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