Security readout for executives and security teams
Plain-English summary
A remote, unauthenticated attacker can bypass authentication and obtain super-admin control of affected FortiOS or FortiProxy systems. That level of access could expose confidential information, permit security-policy changes, and disrupt services. CISA lists the vulnerability as known exploited, making exposed systems an immediate incident-response and remediation concern.
Executive priority
Immediate. Assign accountable owners to inventory, remediate, and investigate affected appliances, prioritizing externally reachable management services. Because exploitation is documented and compromise grants super-admin privileges, patching alone may not resolve risk if an attacker already established access or changed configurations.
Technical view
CVE-2024-55591 is a CWE-288 authentication bypass in the Node.js WebSocket module. Crafted remote requests can grant super-admin privileges without credentials or user interaction. It affects FortiOS 7.0.0–7.0.16 and FortiProxy 7.0.0–7.0.19 and 7.2.0–7.2.12. Its CVSS 3.1 score is 9.6.
Likely exposure
Organizations running an affected version are exposed, especially where the product's administrative service is reachable from untrusted networks. The supplied sources do not establish which individual deployments expose that service or whether every affected installation has been compromised.
Exploitation context
CISA includes CVE-2024-55591 in its Known Exploited Vulnerabilities catalog, supporting active exploitation in the wild. The source bundle does not identify specific threat actors, exploitation scale, targets, or a public exploit. Treat affected reachable appliances as potentially compromised until investigated.
Researcher notes
The authoritative description identifies alternate-path authentication bypass through the Node.js WebSocket module. The bundle names affected ranges but does not reproduce fixed-version tables, workarounds, indicators of compromise, or forensic guidance. Consult the Fortinet advisory directly for those details and avoid inferring safety solely from incomplete inventory metadata.
Mitigation direction
- Inventory FortiOS and FortiProxy deployments and identify versions within the documented affected ranges.
- Follow Fortinet advisory FG-IR-24-535 for supported fixed releases or documented mitigations.
- Prioritize remediation of appliances whose administrative service is reachable from untrusted networks.
- Preserve relevant evidence and begin incident response where exposure or suspicious administrative activity is identified.
Validation and detection
- Confirm each appliance's product and exact version against Fortinet's affected ranges.
- Verify the installed release is identified as fixed in Fortinet advisory FG-IR-24-535.
- Determine whether administrative services were reachable from untrusted networks during the exposure period.
- Review administrative accounts, authentication records, configuration changes, and system activity for unauthorized behavior.
- After remediation, confirm expected administration works and unauthorized access paths are no longer available.
Public sources used
The source record changed after analysis: Material source record changed after analysis.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-288: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2024-55591 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- Yes
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C3.95.9fortinetVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: 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
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2024-55591 added to CISA KEV
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2025-01-14T00:00:00.000Z: CVE-2024-55591 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.fortinet.com/psirt/FG-IR-24-535CVE reference, fortinet
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-55591CVE reference, CISA-ADP · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Authentication Bypass Using an Alternate Path or Channel
Authentication Bypass Using an Alternate Path or Channel represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.