# CVE-2026-21643: FortiClientEMS - SQLi

> Live exploitation tracking for CVE-2026-21643 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-21643

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 9.1
- **Public exploit available:** Yes
- **Affected products:** Fortinet FortiClientEMS
- **Weaknesses:** CWE-89 (Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'))
- **Tags:** enterprise_software

## 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.

## CrowdSec analysis

[CVE-2026-21643](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-21643) is a critical SQL injection vulnerability in Fortinet FortiClientEMS version 7.4.4, allowing unauthenticated attackers to execute arbitrary code or commands by sending specially crafted HTTP requests. This flaw could be exploited remotely to gain unauthorized access, compromise sensitive data, or take control of the affected system.

CrowdSec has been tracking this vulnerability and its exploits since 15th of April 2026.

CrowdSec network data shows that most actors exploiting CVE-2026-21643 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature.
CrowdSec data also reveals a clear uptick in attacks involving CVE-2026-21643 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.

Attackers exploit the `/api/v1/init_consts` endpoint by injecting malicious SQL commands through the `Site` HTTP header, enabling unauthenticated SQL injection attempts against FortiClientEMS servers.

## Timeline

- 2026-02-06: CVE Published. CVE-2026-21643 is published to NVD.
- 2026-04-13: CISA KEV. CVE-2026-21643 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2026-04-15: Rule Released. CrowdSec releases a rule to detect CVE-2026-21643 exploitation attempts against the CrowdSec Network.
- 2026-04-16: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2026-04-20: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2026-21643 for the first time.

## References

- https://github.com/0xBlackash/CVE-2026-21643/blob/main/cve-2026-21643.py
- https://fortiguard.fortinet.com/psirt/FG-IR-25-1142
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21643.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-21643) follows observed exploitation activity for CVE-2026-21643. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.