CVE-2025-48839Network attack vector

Authenticated code execution via out-of-bounds GUI writes

Published Nov 18, 2025 · Updated Nov 18, 2025

Out-of-bounds writes in the FortiADC GUI allow remote authenticated users to execute arbitrary code via crafted HTTP requests. Fortinet identifies multiple affected GUI endpoints but has not published the request fields, bounds error, or functions that perform the writes. Reachability requires authenticated high-privilege access and a specially crafted HTTP request; successful exploitation compromises the appliance process and its data.

CVSS severity6.6
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds writes in the FortiADC GUI allow remote authenticated users to execute arbitrary code via crafted HTTP requests. Fortinet identifies multiple affected GUI endpoints but has not published the request fields, bounds error, or functions that perform the writes. Reachability requires authenticated high-privilege access and a specially crafted HTTP request; successful exploitation compromises the appliance process and its data.

The record

CVE
CVE-2025-48839
Published
Nov 18, 2025
Updated
Nov 18, 2025
Vendor
Fortinet
Product
FortiADC
Classifications
CWE-787, T1210
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2.0 <=6.2.6
  2. Affected versionversion=7.0.0 <=7.0.6
  3. Affected versionversion=7.1.0 <=7.1.5
  4. Affected versionversion=7.2.0 <=7.2.8
  5. Affected versionversion=7.4.0 <=7.4.7
  6. Affected versionversion=7.6.0 <=7.6.2
  7. Affected versionversion=8.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Fortinet · FortiADCversion=6.2.0 <=6.2.6; version=7.0.0 <=7.0.6; version=7.1.0 <=7.1.5; version=7.2.0 <=7.2.8; version=7.4.0 <=7.4.7; version=7.6.0 <=7.6.2; version=8.0.0

Published CVSS scores

6.6Fortinet, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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