Vulnerability Snapshot
CVE-2026-21643 is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.
This vulnerability appears in CISA's Known Exploited Vulnerabilities (KEV) catalog, meaning it has been observed in active attacks. Federal agencies have a remediation deadline; commercial defenders should treat it with equivalent urgency.
Affected technology: forticlientems.
Executive Summary
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.
Why It Matters
CVE-2026-21643 is rated CRITICAL severity, requiring immediate attention from security teams.
⚠️ This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, indicating it has been actively exploited in the wild. Federal agencies must remediate by the deadline.
CVSS Base Score: 9.8/10
EPSS (Exploit Prediction): 38.2% probability of exploitation in the next 30 days.
Affected Technologies
Vendors: fortinet
Products: forticlientems
🛡️What Defenders Should Check
Use Vulnios to continuously monitor your exposure to CVE-2026-21643 and similar vulnerabilities.
References & Sources
How Vulnios Detects This
Vulnios scans for this vulnerability using Trivy and Grype for SBOM-based CVE matching and Vulnios CVE feed continuous monitoring against your asset inventory. Run a scan against your environment to see whether you are exposed; findings are linked back to the original CVE record so triage starts with the patch path already known.
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Affected Products
Sources
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- Critical Vulnerability: CVE-2016-10253 — erlang — erlang\/otp
- Critical Vulnerability: CVE-2017-6880 — cerberus — cerberus_ftp_server
- Critical Vulnerability: CVE-2017-6969 — gnu — binutils
Frequently Asked Questions
What is CVE-2026-21643?
CVE-2026-21643 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. 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 cod
Am I affected?
Check whether your environment runs forticlientems. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.
How urgent is the response?
Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.
How do I remediate?
Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.
Where can I track exploitation activity?
Watch CISA's Known Exploited Vulnerabilities catalog for CVE-2026-21643. Cross-reference with public exploit databases and your own SIEM/IDS for indicator-of-compromise patterns. Vulnios tracks KEV status automatically and surfaces it on the asset findings view.
How does Vulnios help with this?
Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.
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