CVE-2025-53843

highpriority · track · 0EPSS 0.007 · 51 %ileDEEUNLRUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.66% (51st) EPSS
CVSS 7.5 · high
Is it mine?
20 products
Check your exposure
Who says so?
8 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-22

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

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedRUGGEDCOM APE1808siemens_psirt

    Update Fortigate NGFW to V7.4.9 or later following the secure update recommendation procedure. Contact customer support to receive detailed information

  • FixedRUGGEDCOM APE1808cisa_csaf_ot

    Update Fortigate NGFW to V7.4.9 or later following the secure update recommendation procedure. Contact customer support to receive detailed information

  • MitigationRUGGEDCOM APE1808siemens_psirt

    Disable security fabric access into interface. Only allow legit devices in Wifi Controller > Managed FortiAPs (see https://fortiguard.fortinet.com/psirt/FG-IR-25-358 for more information)

  • MitigationRUGGEDCOM APE1808cisa_csaf_ot

    Disable security fabric access into interface. Only allow legit devices in Wifi Controller > Managed FortiAPs (see https://fortiguard.fortinet.com/psirt/FG-IR-25-358 for more information)

02

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US
v3.17.5highAV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.16.9mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:Csecondary · ENISA EU
v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@fortinet.comexploitability 1.6 · impact 5.9
v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · Siemens ProductCERT DE
v3.16.9mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:Csecondary · NCSC-NL NL
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-121USCWE-121USCWE-121USCWE-121USCWE-121US
05

affected products (20)

Products and version ranges known to be affected.

06

advisories (4)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0373Kwetsbaarheden verholpen in Fortinet FortiOSNL2025-11-19csaf · ncsc_nlNL

    Fortinet heeft kwetsbaarheden verholpen in FortiOS (meerdere versies).

  • SSA-864900SSA-864900: Multiple Vulnerabilities in Fortigate NGFW before V7.6.6 on RUGGEDCOM APE1808 Devices2025-05-13csaf · siemens_psirtDE

    Fortinet has published information on vulnerabilities in FortiOS. This advisory lists the related Siemens Industrial products. Siemens has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.

  • WID-SEC-W-2025-2624Fortinet FortiOS (CAPWAP daemon): Mehrere Schwachstellen ermöglichen CodeausführungDeutsch2025-11-18csaf · cert_bundDE

    Ein entfernter, authentisierter Angreifer, oder ein Angreifer aus einem angrenzenden Netzwerk kann mehrere Schwachstellen in Fortinet FortiOS ausnutzen, um beliebigen Programmcode auszuführen.

  • ICSA-25-135-01Siemens RUGGEDCOM APE1808 Devices2025-05-13icsa · cisa_csaf_otUS

    Fortinet has published information on vulnerabilities in FortiOS. This advisory lists the related Siemens Industrial products. Siemens is preparing fix versions and recommends to consult and implement the workarounds provided in Fortinet's upstream security notifications.

07

also known as (5)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducert_bundcisa_csaf_otncsc_nlnvdsiemens_psirtNVDCVE.orgMITRE
published 2025-11-18modified 2026-10-18
09

references (6)

External citations — patches, advisories, analysis.

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