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CVE-2014-8551: The WinCC server in Siemens SIMATIC WinCC 7.0 through SP3, 7.2 before Update 9, and 7.3 before Update 2; SIMAT

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HIGH 10.0DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2014-8551 is a high-severity flaw (CVSS 10.0) affecting simatic pcs 7, simatic pcs7, simatic tiaportal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The WinCC server in Siemens SIMATIC WinCC 7.0 through SP3, 7.2 before Update 9, and 7.3 before Update 2; SIMATIC PCS 7 7.1 through SP4, 8.0 through SP2, and 8.1; and TIA Portal 13 before Update 6 allows remote attackers to execute arbitrary code via crafted packets.

Why this priority

  • Critical severity
  • EPSS top 7%: very likely to be exploited

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

Risk facts

CVSS score10.0 (High)
EPSS exploit chance5.3% (top 7%)
CISA exploited listNo
WeaknessCWE-94
Published2014-11-26
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: siemens

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

siemens simatic pcs 7 DOWNGRADE
Affected: 7.1 sp1
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.1
1. Check installed version
apt-cache policy simatic-pcs-7 || rpm -q simatic-pcs-7 || simatic-pcs-7 --version
2. No fixed release: DOWNGRADE to a release before 7.1 (Debian / Ubuntu)
apt-cache madison simatic-pcs-7 sudo apt install simatic-pcs-7=<VERSION_BEFORE_7.1> sudo apt-mark hold simatic-pcs-7
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list simatic-pcs-7 sudo dnf downgrade simatic-pcs-7-<VERSION_BEFORE_7.1> sudo dnf versionlock add simatic-pcs-7
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.
siemens simatic pcs7 DOWNGRADE
Affected: 7.1 sp3 · 7.1 sp4 · 8.0 sp1 · 8.0 sp2 · 8.1
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.1
1. Check installed version
apt-cache policy simatic-pcs7 || rpm -q simatic-pcs7 || simatic-pcs7 --version
2. No fixed release: DOWNGRADE to a release before 7.1 (Debian / Ubuntu)
apt-cache madison simatic-pcs7 sudo apt install simatic-pcs7=<VERSION_BEFORE_7.1> sudo apt-mark hold simatic-pcs7
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list simatic-pcs7 sudo dnf downgrade simatic-pcs7-<VERSION_BEFORE_7.1> sudo dnf versionlock add simatic-pcs7
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.
siemens simatic tiaportal DOWNGRADE
Affected: 13.0 · 13.0 3 · 13.0 5
Fixed in: no fixed release known
Safe to downgrade to: a release before 13.0
1. Check installed version
apt-cache policy simatic-tiaportal || rpm -q simatic-tiaportal || simatic-tiaportal --version
2. No fixed release: DOWNGRADE to a release before 13.0 (Debian / Ubuntu)
apt-cache madison simatic-tiaportal sudo apt install simatic-tiaportal=<VERSION_BEFORE_13.0> sudo apt-mark hold simatic-tiaportal
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list simatic-tiaportal sudo dnf downgrade simatic-tiaportal-<VERSION_BEFORE_13.0> sudo dnf versionlock add simatic-tiaportal
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.
siemens simatic wincc DOWNGRADE
Affected: 7.0 · 7.0 sp1 · 7.0 sp2 · 7.0 sp3 · 7.2 1 · 7.2 2 · 7.2 3 · 7.2 4
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
1. Check installed version
apt-cache policy simatic-wincc || rpm -q simatic-wincc || simatic-wincc --version
2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)
apt-cache madison simatic-wincc sudo apt install simatic-wincc=<VERSION_BEFORE_7.0> sudo apt-mark hold simatic-wincc
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list simatic-wincc sudo dnf downgrade simatic-wincc-<VERSION_BEFORE_7.0> sudo dnf versionlock add simatic-wincc
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-2014-8551?

simatic pcs 7: downgrade or apply the listed mitigation; simatic pcs7: downgrade or apply the listed mitigation; simatic tiaportal: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2014-8551 being exploited?

CVE-2014-8551 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-2014-8551 affect?

CVE-2014-8551 affects simatic pcs 7, simatic pcs7, simatic tiaportal. Severity is high (CVSS 10.0). The WinCC server in Siemens SIMATIC WinCC 7.0 through SP3, 7.2 before Update 9, and 7.3 before Update 2; SIMATIC PCS 7 7.1 through SP4, 8.0 through SP2, and 8.1; and TIA Portal 13 before Update 6 allows remote attackers to execute arbitrary

How urgent is CVE-2014-8551?

Priority 58/100. Critical severity; EPSS top 7%: very likely to be exploited

Software pages

Siemens vulnerabilities

Related CVEs

References

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