How severe is CVE-2026-21643?

CVE-2026-21643 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21643 being actively exploited?

Yes. CVE-2026-21643 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-04-13, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-21643?

CVE-2026-21643 affects Fortinet Forticlientems. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21643?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-21643 have an EU (EUVD) identifier?

Yes. CVE-2026-21643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5681. It is also flagged as exploited in the EUVD (since 2026-04-13).

When was CVE-2026-21643 published?

CVE-2026-21643 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-21643

CVE-2026-21643 is a critical-severity vulnerability in Fortinet Forticlientems with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-04-13). The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 94% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-04-13)
EU (EUVD) id: EUVD-2026-5681
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-04-13)
Weakness: CWE-89
Affected product: Fortinet Forticlientems
Published: 2026-02-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-21643?: CVE-2026-21643 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-21643 being actively exploited?: Yes. CVE-2026-21643 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-04-13, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-21643?: CVE-2026-21643 affects Fortinet Forticlientems. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21643?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-21643 have an EU (EUVD) identifier?: Yes. CVE-2026-21643 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5681. It is also flagged as exploited in the EUVD (since 2026-04-13).
When was CVE-2026-21643 published?: CVE-2026-21643 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (1)

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

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