CVE-2026-25817
RCE via OS command injection on HMS Ewon Flexy/Cosy+; authenticated access required.
Is CVE-2026-25817 being exploited?
Not confirmed. CVE-2026-25817 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 0.79% probability of exploitation in the next 30 days.
How severe is CVE-2026-25817?
CVE-2026-25817 is rated High with a CVSS score of 8.8. 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-2026-25817?
Not known from our data. No patch reference has been recorded for CVE-2026-25817, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-25817 affect?
CVE-2026-25817 affects HMS Networks Ewon Flexy firmware < 15.0s4, HMS Networks Cosy+ firmware < 22.1s6, HMS Networks Cosy+ firmware < 23.0s3. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25817?
Update firmware to fixed version when available; enforce credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can execute arbitrary commands on the gateway via crafted input.
Patch when possible