CVE-2025-66608
CWE-29 URL validation flaw in FAST/TOOLS web server.
Is CVE-2025-66608 being exploited?
Not confirmed. CVE-2025-66608 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 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2025-66608?
CVE-2025-66608 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-2025-66608?
Yes. A fix has been recorded for CVE-2025-66608. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-66608 affect?
CVE-2025-66608 affects FAST/TOOLS RVSVRN, FAST/TOOLS UNSVRN, FAST/TOOLS HMIWEB, FAST/TOOLS FTEES, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-66608?
Patch when available; restrict access to FAST/TOOLS web components
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote file disclosure via crafted URLs to FAST/TOOLS web server; possible leakage of server files.
Immediate action required
- affected>= R9.01 and <= R10.04
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.