CVE-2021-22130Network attack vector

Authenticated appliance crash via oversized cpuset mask

Published Jun 3, 2021 · Updated Oct 25, 2024

Stack-based buffer overflow in the Fortinet FortiProxy CLI allows remote authenticated users to crash the physical appliance. The diagnose sys cpuset command mishandles an oversized cpuset mask and writes beyond a stack buffer. Authenticated CLI access is required, and Fortinet reports denial of service without known successful code execution.

CVSS severity6.7
Medium
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in the Fortinet FortiProxy CLI allows remote authenticated users to crash the physical appliance. The diagnose sys cpuset command mishandles an oversized cpuset mask and writes beyond a stack buffer. Authenticated CLI access is required, and Fortinet reports denial of service without known successful code execution.

The record

CVE
CVE-2021-22130
Published
Jun 3, 2021
Updated
Oct 25, 2024
Vendor
Fortinet
Product
FortiProxy
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 2024Record 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=FortiProxy 2.0.0 to 2.0.1, 1.2.0 to 1.2.9, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiProxyversion=FortiProxy 2.0.0 to 2.0.1, 1.2.0 to 1.2.9, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.0NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
6.7Fortinet, Inc.CVSS:3.1/AV:L/AC:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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