CVE-2026-22925
DoS via TCP SYN flood on SIMATIC CN 4100 (<V5.0).
Is CVE-2026-22925 being exploited?
Not confirmed. CVE-2026-22925 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-22925?
CVE-2026-22925 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-22925?
Yes. A fix has been recorded for CVE-2026-22925. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-22925 affect?
CVE-2026-22925 affects SIMATIC CN 4100 (all versions < V5.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-22925?
Upgrade to V5.0+; deploy SYN flood mitigations and rate limiting.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Resource exhaustion from high-volume TCP SYNs; attacker can make the service unavailable.
Immediate action required
- affected< V5.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.