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CVE-2026-21643

critical

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.

References

https://www.securityweek.com/organizations-warned-of-exploited-windows-adobe-acrobat-vulnerabilities/

https://thehackernews.com/2026/04/cisa-adds-6-known-exploited-flaws-in.html

https://securityaffairs.com/190775/security/u-s-cisa-adds-adobe-fortinet-microsoft-windows-microsoft-exchange-server-and-microsoft-windows-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/04/13/cisa-adds-seven-known-exploited-vulnerabilities-catalog

https://www.infosecurity-magazine.com/news/fortinet-emergency-patch-ems-bug/

https://www.theregister.com/2026/04/06/forticlient_ems_bug_exploited/

https://www.securityweek.com/fortinet-rushes-emergency-fixes-for-exploited-zero-day/

https://www.databreachtoday.com/attackers-target-zero-day-flaw-in-fortinet-security-software-a-31344

https://www.darkreading.com/vulnerabilities-threats/fortinet-emergency-patch-forticlient-zero-day

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-fortinet-flaw-exploited-in-attacks-by-friday/

https://securityaffairs.com/190392/hacking/cve-2026-35616-fortinet-fixes-actively-exploited-high-severity-flaw.html

https://cyberscoop.com/fortinet-forticlient-ems-zero-day-cve-2026-35616-hotfix-known-exploited/

https://www.bleepingcomputer.com/news/security/new-fortinet-forticlient-ems-flaw-cve-2026-35616-exploited-in-attacks/

https://thehackernews.com/2026/04/fortinet-patches-actively-exploited-cve.html

https://www.helpnetsecurity.com/2026/04/04/forticlient-ems-zero-day-cve-2026-35616/

https://www.helpnetsecurity.com/2026/03/30/forticlient-ems-cve-2026-21643-reported-exploitation/

https://www.bleepingcomputer.com/news/security/critical-fortinet-forticlient-ems-flaw-now-exploited-in-attacks/

https://securityaffairs.com/190158/security/critical-fortinet-forticlient-ems-flaw-exploited-for-remote-code-execution.html

https://www.securityweek.com/fortinet-patches-high-severity-vulnerabilities/

https://thehackernews.com/2026/02/fortinet-patches-critical-sqli-flaw.html

https://securityaffairs.com/187787/security/critical-fortinet-forticlientems-flaw-allows-remote-code-execution.html

https://www.tenable.com/blog/cve-2026-35616-fortinet-forticlientems-improper-access-control-vulnerability-exploited-in-the

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21643

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

Details

Source: Mitre, NVD

Published: 2026-02-06

Updated: 2026-04-14

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.43138

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest