CVE-2025-53843 Details
Description
A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets
A stack-based buffer overflow vulnerability has been identified in Fortinet FortiOS versions 7.6.0 through 7.6.3, 7.4.0 through 7.4.8, and all versions of FortiOS 7.2, 7.0, and 6.4. This vulnerability allows remote authenticated attackers to execute arbitrary code or commands as a low-privileged user by sending specially crafted packets. Exploitation requires significant preparation due to stack protection and Address Space Layout Randomization (ASLR), and the attacker must impersonate an authorized FortiAP or FortiExtender.
Users can upgrade Fortinet FortiOS to version 7.6.4 or above, 7.4.9 or above, or migrate to a fixed release for FortiOS 7.2, 7.0, or 6.4. Follow the recommended upgrade path using the Fortinet upgrade tool.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Nov 19, 2025References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-864900.html | siemens-SADP | |
| https://fortiguard.fortinet.com/psirt/FG-IR-25-358 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| fortinet fortios | >= 6.4.0, < 7.4.9 >= 7.6.0, < 7.6.4 |
CPE
Remediation
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Change History
7 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | siemens-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 9, 2026 | CVE Modified | siemens-SADP |
| Nov 21, 2025 | CVE Modified | [email protected] |
| Nov 20, 2025 | Initial Analysis | [email protected] |
| Nov 18, 2025 | New CVE Received | [email protected] |