CVE-2026-21643

Description

An improper neutralization of special elements used in an sql command ('sql injection') vulnerability in Fortinet FortiClientEMS 7.4.4 may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

Overview

State: PUBLISHED
Assigner (CNA): fortinet
CVSS severity: CRITICAL
CVSS score: 9.1 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Effective score: 9.1 / 10 CRITICAL source: CNA overview
CWE(s): CWE-89
Reserved: 2026-01-02
Published: 2026-02-06 08:24 UTC
Last updated: 2026-04-14 03:55 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21643.json
Linked Threat: CVE-2026-21643 — Fortinet FortiClient EMS: Fortinet FortiClient EMS SQL Injection Vulnerability

CISA Known Exploited Vulnerabilities CISA KEV

CISA has confirmed in-the-wild exploitation of this CVE. Federal agencies must remediate by the due date below; private orgs should treat it as priority-1.

Vulnerability name: Fortinet FortiClient EMS SQL Injection Vulnerability
Vendor / project: Fortinet
Product: FortiClient EMS
Date added to KEV: 2026-04-13
Remediation due: 2026-04-16
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware campaign use: Unknown
CISA notes: https://fortiguard.fortinet.com/psirt/FG-IR-25-1142 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21643
CISA listing: www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-02-06 09:15:49 UTC
NVD last modified: 2026-04-16 16:00:01 UTC
NVD CVSS v3.1: 9.8 / 10 CRITICAL source: psirt@fortinet.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 5.9 / 10
EPSS score: 0.6252 (probability of exploitation in next 30 days)
EPSS percentile: 98.39% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-5681
Assigner: fortinet
Published: Feb 6, 2026, 8:24:43 AM
Updated: Apr 14, 2026, 3:55:26 AM
EUVD base score (CVSS 3.1): 9.1 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EUVD-reported EPSS: 62.5200
Vendors: Fortinet
Products: FortiClientEMS (7.4.4)

ENISA description: An improper neutralization of special elements used in an sql command ('sql injection') vulnerability in Fortinet FortiClientEMS 7.4.4 may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

EUVD references (1)

https://fortiguard.fortinet.com/psirt/FG-IR-25-1142

Affected products (1)

Vendor	Product	Versions	Platforms
Fortinet	FortiClientEMS	`7.4.4` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:fortinet:forticlientems:7.4.4:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://fortiguard.fortinet.com/psirt/FG-IR-25-1142

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://fortiguard.fortinet.com/psirt/FG-IR-25-1142

Web references (7)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://attackerkb.com/topics/CVE-2026-21643 rapid7:attackerkb.com
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21643 rapid7:cve.mitre.org
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-5681 rapid7:euvd.enisa.europa.eu
https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-21643 rapid7:services.nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-21643 rapid7:www.cve.org
http://cwe.mitre.org/data/definitions/89.html rapid7:cwe.mitre.org
https://www.fortiguard.com/psirt/FG-IR-25-1142 rapid7:www.fortiguard.com

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://fortiguard.fortinet.com/psirt/FG-IR-25-1142 psirt@fortinet.com Vendor Advisory
https://github.com/0xBlackash/CVE-2026-21643/blob/main/cve-2026-21643.py 134c704f-9b21-4f2e-91b3-4a467353bcc0 Exploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21643 134c704f-9b21-4f2e-91b3-4a467353bcc0 US Government Resource

Indicators (2)

IOCs linked to the auto-promoted Threat row.

Type	Value	VirusTotal	Attached
cwe	`CWE-89`	no local data	2026-05-14 02:58 UTC
cve	`CVE-2026-21643`	no local data	2026-05-14 02:58 UTC

Remediations (9)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-14 09:18 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-14 09:18 UTC
Nvd - Cve-2026-21643

web:nvd.nist.gov

Official websites use .gov A .gov website belongs to an official government organization in the United States.

2026-05-14 09:18 UTC
CVE Record: CVE-2026-21643

web:www.cve.org

Vulnerability detail for CVE-2026-21643 Notice: Expanded keyword searching of CVE Records (with limitations) is now available in the search box above. Learn more here.

2026-05-14 09:18 UTC
Patch Now! CVE-2026-35616 and CVE-2026-21643: Fortinet EMS Actively ...

web:www.greenbone.net

Greenbone's OPENVAS ENTERPRISE FEED includes separate remote banner checks for CVE - 2026 -35616 [3] and CVE-2026-21643 [4] and provides a dedicated family of tests for Fortinet vulnerabilities, allowing defenders to detect and mitigate actively evolving threats.

2026-05-14 09:18 UTC
Microsoft May 2026 Patch Tuesday Fixes 130+ Vulnerabilities ... - LinkedIn

web:www.linkedin.com

Microsoft has released its May 2026 Patch Tuesday security updates, addressing more than 130 vulnerabilities across its software ecosystem, including Windows, Microsoft Office, SharePoint Server ...

2026-05-14 09:18 UTC
Resources - ManageEngine

web:www.manageengine.com

Explore known issues and workarounds for Microsoft patches in Patch Manager Plus — including update failures, PowerShell Direct issues, and Office 365 deployment errors.

2026-05-14 09:18 UTC
CVE-2026-21643 | Fortinet FortiClient EMS Vulnerability | UpGuard

web:www.upguard.com

CVE-2026-21643 is a critical SQL injection vulnerability in Fortinet FortiClient EMS 7.4.4 allowing unauthenticated RCE. Immediate patching is required.

2026-05-14 09:18 UTC
CISA Required Action

CISA KEV

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due date: 2026-04-16 Known ransomware campaign use: Unknown

2026-05-14 01:13 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-21643.json.

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                "id": "CVE-2026-21643",
                "options": [
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                  },
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                  },
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                  }
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                "role": "CISA Coordinator",
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