CVE-2026-22924: A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0)

Q: How do I fix CVE-2026-22924?

simatic cn 4100 firmware: upgrade to 5.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-22924 being exploited?

CVE-2026-22924 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-2026-22924 affect?

CVE-2026-22924 affects simatic cn 4100 firmware. Severity is critical (CVSS 9.1). A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application does not properly restrict unauthenticated connections and is susceptible to resource exhaustion conditions. This could allow an attacke

Q: How urgent is CVE-2026-22924?

Priority 42/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-22924 is a critical-severity flaw (CVSS 9.1) affecting simatic cn 4100 firmware. 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 CN 4100 (All versions < V5.0). The affected application does not properly restrict unauthenticated connections and is susceptible to resource exhaustion conditions. This could allow an attacker to disrupt normal operations or perform unauthorized actions, potentially impacting system availability and integrity.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Siemens AG · Vendor: siemens

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 10:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

siemens simatic cn 4100 firmware UPGRADE

Affected: < 5.0

Fixed in: 5.0

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2026-22924?

simatic cn 4100 firmware: upgrade to 5.0. Exact commands for each OS are on this page.

Is CVE-2026-22924 being exploited?

CVE-2026-22924 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-2026-22924 affect?

CVE-2026-22924 affects simatic cn 4100 firmware. Severity is critical (CVSS 9.1). A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0). The affected application does not properly restrict unauthenticated connections and is susceptible to resource exhaustion conditions. This could allow an attacke

How urgent is CVE-2026-22924?

Priority 42/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Siemens vulnerabilities

Related CVEs

CVE-2026-22925 HIGH 7.5 UPGRADE A vulnerability has been identified in SIMATIC CN 4100 (All versions < V5.0)
CVE-2023-29131 HIGH 7.4 UPGRADE A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.5)
CVE-2025-40937 HIGH 8.3 UPGRADE A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1)
CVE-2025-40938 HIGH 8.1 UPGRADE A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1)
CVE-2025-40940 MEDIUM 4.9 UPGRADE A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1)

References

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