CRITICALCVSS 9.8Actively exploited · CISA KEV since 2025-01-14Vulnerability

CVE-2024-55591

Fortinet FortiOS and FortiProxy contain an authentication bypass vulnerability that may allow an unauthenticated, remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.

Properties

Euvd product
FortiOS, FortiProxy
Vulnerability name
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
First seen
2026-08-05T03:55:59+00:00
Cvss score
9.8
Epss score
0.94149
Last seen
2026-10-19T12:00:27+00:00
Due date
2025-01-21
Euvd assigner
fortinet
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2025-01-14T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2025-01-14
Euvd base score version
3.1
Score
9.8
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Fortinet
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
9.6

Related Entities (12)

MENTIONED_IN (7)

→[Campaign]Ransomware Analysis: Go Binary and Fast Encryption
→[Campaign]The Gentleman Ransomware | Defense Evasion TTPs Uncovered
→[Campaign]Thus Spoke…The Gentlemen
→[Campaign]Unnamed campaign (ID 69a9…)
→[Campaign]Unnamed campaign (ID 69bd…)
→[Campaign]An Overview of The Gentlemen's TTPs
→[Campaign]MuddyWater Exposed: Inside an Iranian APT operation

AFFECTS_PRODUCT (2)

→[Product]cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability

HAS_WEAKNESS (1)

→[Weakness]Authentication Bypass Using an Alternate Path or Channel

INVOLVES (1)

←[Signal]kev_added · 2025-01-14

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CVE-2024-55591 (CVSS 9.8) — Ninja Signal Threat Intelligence | Ninja Signal