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CVE-2025-53843

HIGH

7.5

CVSS Score

Published: November 18, 2025 at 05:01 PM UTC

Updated: October 18, 2026 at 08:10 PM UTC

2 products affected across 2 vendorsFortiOSRUGGEDCOM APE1808 Firmware

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Severity

HIGH7.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

A stack-based buffer overflow 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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FortiOS · Fortinet

95%

6.4.0 ≤ v < 7.4.97.6.0 ≤ v < 7.6.46.4.0 6.4.1 6.4.10 6.4.11 6.4.12 6.4.13 6.4.14 6.4.15 6.4.16 6.4.2 6.4.3 6.4.4 6.4.5 6.4.6 6.4.7 6.4.8 6.4.9 7.0.0 7.0.1 7.0.10 7.0.11 7.0.12 7.0.13 7.0.14 7.0.15 7.0.16 7.0.17 7.0.18 7.0.2 7.0.3 7.0.4 7.0.5 7.0.6 7.0.7 7.0.8 7.0.9 7.2.0 7.2.1 7.2.10 7.2.11 7.2.12 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 7.2.7 7.2.8 7.2.9 7.4.0 7.4.1 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 7.4.7 7.4.8 7.6.0 7.6.1 7.6.2 7.6.3

Affected range stops below 7.4.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.6.4, so it looks safe — our inference, not a vendor statement

RUGGEDCOM APE1808 Firmware · Siemens

60%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://fortiguard.fortinet.com/psirt/FG-IR-25-358

References (2)

Vendor Advisory

Source: cverecord

https://fortiguard.fortinet.com/psirt/FG-IR-25-358

Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

https://cert-portal.siemens.com/productcert/html/ssa-864900.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-121

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