How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: Required — someone has to click, open or visit something.
- Scope: Changed — a successful attack reaches components beyond the vulnerable one.
- Confidentiality impact: High — total loss, or loss the attacker controls.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: High — total loss, or loss the attacker controls.
Weakness class
CVE-2025-66606 is classified as CWE-86: Improper Neutralization of Invalid Characters in Identifiers in Web Pages. The product does not neutralize or incorrectly neutralizes invalid characters or byte sequences in the middle of tag names, URI schemes, and other identifiers.
Affected software
CVE-2025-66606 is recorded against 1 package.
- fast\/tools (from r9.01 up to r10.04)
Timeline and source
Published on 9 February 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.
References
web-material3.yokogawa.com
Other advisories for this package
fast\/tools has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-86: Improper Neutralization of Invalid Characters in Identifiers in Web Pages) in other software:
