What is CVE-2026-21643?

CVE-2026-21643 is a critical-severity vulnerability in Fortinet Forticlientems, classified under SQL Injection. CVSS score: 9.8/10. Published 2026-02-06.

How severe is CVE-2026-21643?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-21643 known to be exploited?

Yes. CVE-2026-21643 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-13), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

SQL Injection in Fortinet Forticlientems

CVE-2026-21643

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.

Vulnerability class: SQL Injection

Published 2026-02-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.939 (99.8th percentile), scored 2026-10-15.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.941 · newest: 0.939 · change: -0.002

Affected products

Fortinet Forticlientems — versions 7.4.4

Weakness classification (CWE)

CWE-89 — SQL Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-04-13. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 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.

Public proof-of-concept exploits

References

fortiguard.fortinet.com/psirt/FG-IR-25-1142 (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2026-21643?: CVE-2026-21643 is a critical-severity vulnerability in Fortinet Forticlientems, classified under SQL Injection. CVSS score: 9.8/10. Published 2026-02-06.
How severe is CVE-2026-21643?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-21643 known to be exploited?: Yes. CVE-2026-21643 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-13), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.