How severe is CVE-2026-21643?

CVE-2026-21643 has a CVSS 3.1 base score of 9.1 (CRITICAL). EPSS estimates a 93.7% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2026-21643: Fortinet FortiClient EMS SQL Injection

CISA Known Exploited Vulnerabilities

Fortinet FortiClient EMS SQL Injection Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

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.

CISA notes
https://fortiguard.fortinet.com/psirt/FG-IR-25-1142 ; https://nvd.nist.gov/vuln/detail/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.

Severity

CVSS 3.1 · CNA9.1 CRITICAL

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

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
Fortinet	FortiClientEMS	7.4.4

References

1 Links

Other references

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

Record Details

Published

2026-02-06

Last updated

2026-04-14

Assigner (CNA)

fortinet

Credited to

More from Fortinet

CVE-2018-133799.1

Fortinet FortiOS SSL VPN Path Traversal Vulnerability

CVE-2022-406849.8

Fortinet Multiple Products Authentication Bypass Vulnerability

CVE-2025-252579.6

Fortinet FortiWeb SQL Injection Vulnerability

CVE-2022-424759.3

Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-89 · SQL Injection

Application Security Tools Penetration Testing Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.