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CVE-2024-55591

exploited in the wild☆ pin

CVSS

—

Reports

11

First seen

Jan 15, 2025

Last seen

Sep 1, 2026

Affected product

FortiOS, FortiProxy

Associated actors

The Gentlemen ×4 Gunra ×3 GOLD SHERWOOD ×1 LARVA-368 ×1

Recent reports

The Gentlemen RaaS: GOLD SHERWOOD's Ransomware Playbook and Operational TTPs

Sophos NewsSep 1, 2026 Critical

US and South Korea warn of Gunra ransomware targeting government agencies

Bleeping ComputerAug 11, 2026 Critical

FBI, South Korea warn of Gunra ransomware gang targeting critical infrastructure

The Record (Recorded Future News)Aug 10, 2026 Critical

CISA/FBI Advisory: Gunra Ransomware-as-a-Service Targeting Government and Critical Infrastructure

CISA AdvisoriesAug 10, 2026 High

The Gentlemen Ransomware: RaaS Operator Grows Rapidly with Custom Tooling

Palo Alto Unit 42Jul 11, 2026 High

FortiBleed: Widespread credential exposure affecting Fortinet devices

Canadian Centre AlertsJun 18, 2026 Critical

The Gentlemen Ransomware Claims 478 Victims, Can Spread Like a Worm

The Hacker NewsJun 11, 2026 High

The Gentlemen Ransomware: Defense Evasion TTPs and Incident Analysis

Huntress BlogMay 21, 2026 High

The Gentlemen RaaS: Internal Leak Exposes Operators, Infrastructure, and Tactics

Check Point ResearchMay 13, 2026 Critical

Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability (CVE-2024-55591)

NICS TaiwanJan 17, 2025 High

Multiple Vulnerabilities in Fortinet Products (GovCERT.HK Alert A25-01-08)

GovCERT.HKJan 15, 2025

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