Vulnerability in Fortinet Fortios
CVE-2025-25255
An Improperly Implemented Security Check for Standard vulnerability [CWE-358] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.11, FortiProxy 7.2 all versions, FortiProxy 7.0.1 through 7.0.22 may allow an unauthenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Fortinet Fortios — versions 7.6.0
- Fortinet Fortiproxy — versions 7.6.0, 7.4.0, 7.2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- fortiguard.fortinet.com/psirt/FG-IR-24-372 (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-25255?
- CVE-2025-25255 is a medium-severity vulnerability in Fortinet Fortios, classified under CWE-358. CVSS score: 5.3/10. Published 2025-10-14.
- How severe is CVE-2025-25255?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2025-25255 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.