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CVE-2024-55591

critical

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

https://unit42.paloaltonetworks.com/the-gentlemen-ransomware/

https://blog.checkpoint.com/research/cyber-threats-spike-in-april-2026-as-ransomware-expands-and-attack-volumes-climb-after-short-lived-moderation/

https://cloud.google.com/blog/topics/threat-intelligence/ransomware-ttps-shifting-threat-landscape/

https://www.greynoise.io/blog/unmasking-cisas-hidden-kev-ransomware-updates

https://securelist.com/malware-report-q2-2025-pc-iot-statistics/117421/

https://www.darkreading.com/cyberattacks-data-breaches/fortinet-products-in-crosshairs-again

https://cybelangel.com/blog/qilin-ransomware-tactics-attack/

https://databreaches.net/2025/07/12/qilin-emerged-as-the-most-active-group-exploiting-unpatched-fortinet-vulnerabilities/

https://www.infosecurity-magazine.com/news/automation-vulnerability/

https://www.hipaajournal.com/qilin-ransomware-group-exploiting-critical-fortinet-flaws/

https://thehackernews.com/2025/06/former-black-basta-members-use.html

https://www.bleepingcomputer.com/news/security/critical-fortinet-flaws-now-exploited-in-qilin-ransomware-attacks/

https://securityaffairs.com/178736/hacking/attackers-exploit-fortinet-flaws-to-deploy-qilin-ransomware.html

https://www.bleepingcomputer.com/news/security/critical-fortiswitch-flaw-lets-hackers-change-admin-passwords-remotely/

https://thehackernews.com/2025/03/vanhelsing-raas-launch-3-victims-5k.html

https://www.darkreading.com/cyberattacks-data-breaches/critical-fortinet-vulnerability-draws-fresh-attention

https://securityaffairs.com/175583/security/u-s-cisa-adds-fortinet-fortios-fortiproxy-and-github-action-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://therecord.media/mora001-ransomware-gang-exploiting-vulnerability-lockbit

https://www.theregister.com/2025/03/14/ransomware_gang_lockbit_ties/

https://www.darkreading.com/cyberattacks-data-breaches/actor-tied-lockbit-ransomware-targets-fortinet-users

https://www.bleepingcomputer.com/news/security/new-superblack-ransomware-exploits-fortinet-auth-bypass-flaws/

https://www.forescout.com/blog/new-ransomware-operator-exploits-fortinet-vulnerability-duo/

https://www.securityweek.com/ivanti-fortinet-patch-remote-code-execution-vulnerabilities/

https://www.bleepingcomputer.com/news/security/fortinet-warns-of-new-zero-day-exploited-to-hijack-firewalls/

https://www.bleepingcomputer.com/news/security/fortinet-discloses-second-firewall-auth-bypass-patched-in-january/

https://www.darkreading.com/cloud-security/actively-exploited-fortinet-zero-day-attackers-super-admin-privileges

https://www.theregister.com/2025/01/21/fortinet_firewalls_still_vulnerable/

https://www.securityweek.com/fortinet-confirms-new-zero-day-exploitation/

https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/cve-2024-55591-fortinet-fortios-fortiproxy-zero-day/

https://www.bleepingcomputer.com/news/security/fortinet-warns-of-auth-bypass-zero-day-exploited-to-hijack-firewalls/

https://thehackernews.com/2025/02/ivanti-patches-critical-flaws-in.html

https://www.tenable.com/blog/cve-2026-35616-fortinet-forticlientems-improper-access-control-vulnerability-exploited-in-the

https://www.tenable.com/blog/cve-2025-64155-exploit-code-released-for-critical-fortinet-fortisiem-command-injection

https://www.tenable.com/blog/cve-2025-64446-fortinet-fortiweb-zero-day-path-traversal-vulnerability-exploited-in-the-wild

https://www.tenable.com/blog/cve-2025-25256-proof-of-concept-released-for-critical-fortinet-fortisiem-command-injection

https://www.tenable.com/blog/cve-2025-32756-zero-day-vulnerability-in-multiple-fortinet-products-exploited-in-the-wild

https://www.tenable.com/blog/cve-2024-55591-fortinet-authentication-bypass-zero-day-vulnerability-exploited-in-the-wild

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55591

https://fortiguard.fortinet.com/psirt/FG-IR-24-535

Details

Source: Mitre, NVD

Published: 2025-01-14

Updated: 2026-07-08

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.98259

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest