CVE-2026-24349: A vulnerability has been identified in SIMATIC WinCC Unified PC Runtime V16 (All versions), SIMATIC WinCC Unif

Routine

HIGH 7.1UPGRADE

CVE-2026-24349 is a high-severity flaw (CVSS 7.1) affecting simatic wincc unified pc runtime. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been identified in SIMATIC WinCC Unified PC Runtime V16 (All versions), SIMATIC WinCC Unified PC Runtime V17 (All versions), SIMATIC WinCC Unified PC Runtime V18 (All versions), SIMATIC WinCC Unified PC Runtime V19 (All versions), SIMATIC WinCC Unified PC Runtime V20 (All versions), SIMATIC WinCC Unified PC Runtime V21 (All versions < V21 Update 2). Insufficient protection of key material in WinCC Certificate Manager that coul

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 100%)
CISA exploited list	No
Weakness	CWE-313
Published	2026-06-09
Last modified	2026-10-23

Publisher (CNA): Siemens AG · Vendor: siemens

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-09 10:16 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated Record last modified

siemens simatic wincc unified pc runtime UPGRADE

Affected: >= 16 and <= 20 · 21 · 21 update1

Fixed in: newer than 20

Safe to downgrade to: a release before 16

1. Check installed version

apt-cache policy simatic-wincc-unified-pc-runtime || rpm -q simatic-wincc-unified-pc-runtime || simatic-wincc-unified-pc-runtime --version

2. UPGRADE to newer than 20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simatic-wincc-unified-pc-runtime

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simatic-wincc-unified-pc-runtime

Note

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

3. If no update is available yet, DOWNGRADE to a release before 16 (Debian / Ubuntu)

apt-cache madison simatic-wincc-unified-pc-runtime sudo apt install simatic-wincc-unified-pc-runtime=<VERSION_BEFORE_16> sudo apt-mark hold simatic-wincc-unified-pc-runtime

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simatic-wincc-unified-pc-runtime sudo dnf downgrade simatic-wincc-unified-pc-runtime-<VERSION_BEFORE_16> sudo dnf versionlock add simatic-wincc-unified-pc-runtime

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-2026-24349?

simatic wincc unified pc runtime: upgrade to newer than 20. Exact commands for each OS are on this page.

Is CVE-2026-24349 being exploited?

CVE-2026-24349 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-2026-24349 affect?

CVE-2026-24349 affects simatic wincc unified pc runtime. Severity is high (CVSS 7.1). A vulnerability has been identified in SIMATIC WinCC Unified PC Runtime V16 (All versions), SIMATIC WinCC Unified PC Runtime V17 (All versions), SIMATIC WinCC Unified PC Runtime V18 (All versions), SIMATIC WinCC Unified PC Runtime V19 (All

How urgent is CVE-2026-24349?

Priority 25/100. High severity

References

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