CVE-2013-2781: Use-after-free vulnerability in the server application in 3S CODESYS Gateway 2.3.9.27 allows remote attackers

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HIGH 10.0DOWNGRADE

CVE-2013-2781 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.

Use-after-free vulnerability in the server application in 3S CODESYS Gateway 2.3.9.27 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via unspecified vectors.

Why this priority

Critical severity
EPSS top 10%: very likely to be exploited

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

Risk facts

CVSS score	10.0 (High)
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-399
Published	2013-05-23
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

2013-05-23 13:36 UTCPublished CVE record published
2026-06-16 23:53 UTCUpdated Record last modified

3s-software codesys gateway-server DOWNGRADE

Affected: 2.3.9.27

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.9.27

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.3.9.27 (Debian / Ubuntu)

apt-cache madison codesys-gateway-server sudo apt install codesys-gateway-server=<VERSION_BEFORE_2.3.9.27> sudo apt-mark hold codesys-gateway-server

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

dnf --showduplicates list codesys-gateway-server sudo dnf downgrade codesys-gateway-server-<VERSION_BEFORE_2.3.9.27> sudo dnf versionlock add codesys-gateway-server

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-2013-2781?

codesys gateway-server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-2781 being exploited?

CVE-2013-2781 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-2013-2781 affect?

CVE-2013-2781 affects codesys gateway-server. Severity is high (CVSS 10.0). Use-after-free vulnerability in the server application in 3S CODESYS Gateway 2.3.9.27 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via unspecified vectors.

How urgent is CVE-2013-2781?

Priority 58/100. Critical severity; EPSS top 10%: very likely to be exploited

Related CVEs

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
CVE-2012-4704 HIGH 10.0 UPGRADE Array index error in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary co

References

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