CVE-2026-21643

Q: How do I fix CVE-2026-21643?

Upgrade forticlientems to 7.4.5 or later.

Q: Is CVE-2026-21643 being actively exploited?

Yes. CVE-2026-21643 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-04-16. Treat it as a priority whatever its CVSS score says.

Q: How severe is CVE-2026-21643?

CVE-2026-21643 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-21643 affect?

Published advisories record a fix for forticlientems (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-89SQL Injection

How to fix

Remediation Available

forticlientemsNVD

Affected:>= 7.4.0, < 7.4.5Fixed in:7.4.5CVE-2026-21643derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

94.08%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-04-16

References

Exploit1

github.com

Vendor Advisory1

fortiguard.fortinet.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-89 (SQL Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-3704	High	7.5	100%	-	Fix
CVE-2015-7297	High	7.5	100%	-	-
CVE-2024-29824	High	8.8	100%	KEV	Fix
CVE-2023-34362	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-7481	High	7.5	100%	KEV + Ransom	Fix
CVE-2024-29826	High	8.8	100%	-	Fix

Common questions

How do I fix CVE-2026-21643?

Upgrade forticlientems to 7.4.5 or later.

Is CVE-2026-21643 being actively exploited?

Yes. CVE-2026-21643 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-04-16. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2026-21643?

CVE-2026-21643 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-21643 affect?

Published advisories record a fix for forticlientems (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-21643

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-14.