CVE-2025-25249
Exploitation confirmed. First attested on 2026-09-08 by CISA-ADP, CISA KEV, GCVE · previdian.
- Published2026-01-13
- Fixed in7.6.4 · 7.4.9 · 7.2.12 · 7.0.18
- WeaknessCWE-122 · CWE-787
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-27 15:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-25249?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-25249?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.6 | ≥ 7.6.0, < 7.6.4 | 7.6.4 | NVD |
| 7.4 | ≥ 7.4.0, < 7.4.9 | 7.4.9 | NVD |
| 7.2 | ≥ 7.2.0, < 7.2.12 | 7.2.12 | NVD |
| 7.0 | ≥ 6.4.0, < 7.0.18 | 7.0.18 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 25.1 | = 25.1.39 | no fix published | NVD |
| 25.1 | = 25.1.51 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.2 | ≥ 7.2.0, < 7.2.7 | 7.2.7 | NVD |
| 7.0 | ≥ 7.0.0, < 7.0.6 | 7.0.6 | NVD |
1 more product in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Siemens RUGGEDCOM APE1808 Devices
RUGGEDCOM APE1808
SSA-864900: Multiple Vulnerabilities in Fortigate NGFW before V7.6.6 on RUGGEDCOM APE1808 Devices
RUGGEDCOM APE1808 with Fortinet NGFW < V7.4.9
Fix
- Update Fortinet FortiOS to 7.6.4 · 7.4.9 · 7.2.12 · 7.0.18
- CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-09-12
- Vendor fix Siemens ProductCERT SSA-864900 · 1 productUpdate Fortigate NGFW to V7.4.9 or later following the secure update recommendation procedure. Contact customer support to receive detailed information
- Vendor fix CISA ICSA-25-135-01 · 1 productUpdate Fortigate NGFW to V7.4.9 or later following the secure update recommendation procedure. Contact customer support to receive detailed information
- Mitigation from the vendor Siemens ProductCERT SSA-864900 · 1 productFor each interface, remove "fabric" access (see https://fortiguard.fortinet.com/psirt/FG-IR-25-084)
- Mitigation from the vendor CISA ICSA-25-135-01 · 1 productFor each interface, remove "fabric" access (see https://fortiguard.fortinet.com/psirt/FG-IR-25-084)
Advisories and patches
- fortiguard.fortinet.comMitigation · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-09-09
- Patch Due Date
- 2026-09-12
- Ransomware Use
- Unknown
- Required Action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-01-13
- Last Modified
- 2026-10-07
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2025-25249?
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What is the CVSS score for CVE-2025-25249?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.