Summary
generated automatically from NVD dataCVE-2025-25249 is a heap-based buffer overflow (CWE-122) in Fortinet FortiOS and FortiSwitchManager, with FortiOS 6.4 affected in all versions. An attacker can send specially crafted packets over the network to execute unauthorized code or commands, though the attack complexity is rated high. The flaw has a CVSS v3.1 score of 8.1 (HIGH) and is listed in the CISA KEV catalog, which indicates active exploitation.
NVD description
A heap-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows attacker to execute unauthorized code or commands via specially crafted packets
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-09-09. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-09-12
EPSS · FIRST.org
3.8%probability of exploitation in the next 30 days
Higher than 89% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 13 janv. 2026
- Updated
- 7 oct. 2026
- Status
- Analyzed
- Source
- psirt@fortinet.com
Affected products
Weaknesses (CWE)
References (4)
- https://fortiguard.fortinet.com/psirt/FG-IR-25-084MitigationVendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-864900.htmlThird Party Advisory
- https://socradar.io/blog/cve-2025-25249-pivotc2-fortigate-rat/ExploitThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-25249US Government Resource
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