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CVE-2024-55591VulnerabilityPublished Updated

CVE-2024-55591: Fortinet FortiOS · Execute unauthorized code or commands

Affects Fortinet FortiOSSource CVE Database V5

0

Exploited in the wild · used in ransomware campaigns · KEV due 21 Jan 2025 · public detection template (Nuclei) · 94% EPSS · patch available : patch Fortinet FortiOS now.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
9.6Critical
How severe the flaw is on the 0–10 CVSS scale.
KEV deadline
 US federal agencies must patch by this date; a sensible deadline for everyone else.
Ransomware
Used in ransomware campaigns
EPSS
94.3% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 14 Jan 2025

  2. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  3. Exploited in the wild: evidence found.

    Listed in CISA KEV the same day as disclosure

  4. Observed by OffSeq Mirage: evidence found.

    2 exposed hosts found; no attack traffic recorded

Timeline

  1. CVE ID reserved

    by fortinet

    , 36 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. Added to CISA KEV (opens in a new tab)

    exploitation confirmed · ransomware use known

    , the same day as disclosure

  4. KEV remediation due

    US federal deadline

    , 7 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), OffSeq Mirage (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected software

ProductAffectedFixed in
Fortinet FortiOSAffected
  • =7.0.0
  • >=7.0.0 <=7.0.16
  • >=7.0.0 <=7.0.19
  • >=7.2.0 <=7.2.12
Fixed in–

Check the firmware or software version for Fortinet FortiOS in the device's admin interface against the vendor advisory.

Description

An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

References

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