CVE-2025-46776

Privileged code execution via json_cli buffer overflow

Published Nov 18, 2025 · Updated Nov 18, 2025

Classic buffer overflow in Fortinet FortiExtender json_cli allows local users with administrative access to execute arbitrary code. The json_cli component copies attacker-controlled CLI input into a destination buffer without verifying that the input fits. Exploitation requires high-privileged local access and a high-complexity crafted command, and successful exploitation runs code in the appliance context.

CVSS severity6.4
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Fortinet FortiExtender json_cli allows local users with administrative access to execute arbitrary code. The json_cli component copies attacker-controlled CLI input into a destination buffer without verifying that the input fits. Exploitation requires high-privileged local access and a high-complexity crafted command, and successful exploitation runs code in the appliance context.

The record

CVE
CVE-2025-46776
Published
Nov 18, 2025
Updated
Nov 18, 2025
Vendor
Fortinet
Product
FortiExtender
Classifications
CWE-120, T1068
Attack vector
local
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=7.0.0 <=7.0.5
  2. Affected versionversion=7.2.0 <=7.2.5
  3. Affected versionversion=7.4.0 <=7.4.6
  4. Affected versionversion=7.6.0 <=7.6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Fortinet · FortiExtenderversion=7.0.0 <=7.0.5; version=7.2.0 <=7.2.5; version=7.4.0 <=7.4.6; version=7.6.0 <=7.6.1

Published CVSS scores

6.4FortinetCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1068Exploitation for Privilege Escalation

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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