Security readout for executives and security teams
Plain-English summary
CVE-2021-26104 lets a low-privileged authenticated local CLI user on affected Fortinet management products potentially run operating system commands as root. Business risk is highest where many administrators, delegated users, or shared accounts can access FortiManager, FortiAnalyzer, or FortiPortal.
Executive priority
Treat this as a high-priority management-plane issue, especially in environments with delegated Fortinet administration. It is not described as remotely exploitable without credentials, but root execution on these platforms can undermine security operations and network control.
Technical view
The source bundle describes multiple CWE-78 OS command injection flaws in CLI command parameters. Affected ranges include FortiManager, FortiAnalyzer, and FortiPortal versions listed in the CVE. Attack requires local access and low privileges, but successful exploitation can provide root-level command execution.
Likely exposure
Exposure is limited to affected Fortinet management platforms with local authenticated CLI access. Internet exposure alone is not established by the sources; valid local CLI access is the key prerequisite.
Exploitation context
The bundle does not show CISA KEV listing or cited active exploitation. CVSS is 7.8 high, with local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Researcher notes
Evidence supports local authenticated command injection via crafted CLI parameters, not unauthenticated remote exploitation. The provided bundle does not include fixed versions or detailed mitigations, so remediation should be tied to Fortinet’s advisory before change execution.
Mitigation direction
- Check FortiGuard advisory FG-IR-21-037 for vendor upgrade guidance.
- Inventory FortiManager, FortiAnalyzer, and FortiPortal versions against affected ranges.
- Remove unnecessary local CLI accounts and shared low-privilege access.
- Restrict CLI access to trusted administrative paths and users.
- Prioritize remediation on systems managing critical firewall or logging infrastructure.
Validation and detection
- Confirm product and version for every Fortinet management appliance.
- Identify users with local CLI access, including low-privilege accounts.
- Review whether affected versions remain in production or backup environments.
- Check authentication and administrative logs for unusual CLI activity.
- Document vendor advisory status and remediation owner for each asset.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26104 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:U/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.
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:U/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H/RL:U/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-21-037CVE reference · x_refsource_CONFIRM
- https://github.com/orangecertcc/security-research/security/advisories/GHSA-f73m-fvj3-m2pmCVE reference · x_refsource_MISC
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.