What is CVE-2025-48839?

CVE-2025-48839 is a medium-severity vulnerability in Fortinet Fortiadc, classified under Out-of-bounds Write. CVSS score: 6.6/10. Published 2025-11-18.

How severe is CVE-2025-48839?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Buffer overflow in Fortinet Fortiadc

CVE-2025-48839

An Out-of-bounds Write vulnerability [CWE-787] in FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, 7.2 all versions, 7.1 all versions, 7.0 all versions, 6.2 all versions may allow an authenticated attacker to execute arbitrary code via specially crafted HTTP requests.

Vulnerability class: Buffer Overflow

EPSS: 0.004 (28.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fortinet Fortiadc — versions 8.0.0, 7.6.0, 7.4.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

psirt@fortinet.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-48839?: CVE-2025-48839 is a medium-severity vulnerability in Fortinet Fortiadc, classified under Out-of-bounds Write. CVSS score: 6.6/10. Published 2025-11-18.
How severe is CVE-2025-48839?: Medium severity. CVSS v3 base score is 6.6 out of 10.