Security readout for executives and security teams
Plain-English summary
FortiWLC 8.6.1 and earlier can let a low-privileged authenticated remote user bypass GUI limits and run commands with full admin rights. For affected wireless controller environments, this could enable takeover of controller management functions and disruption or manipulation of wireless operations.
Executive priority
Treat this as high priority for organizations using FortiWLC. The issue requires credentials, but successful abuse could give full administrative control over wireless controller management. Prioritize externally reachable or shared-admin environments first.
Technical view
CVE-2021-42758 is an improper access control issue in Fortinet FortiWLC. The published CVSS 3.1 score is 8.8, with network attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to FortiWLC deployments running 8.6.1 or below, especially where low-privileged accounts can reach the management GUI remotely. Internet-exposed or broadly reachable management interfaces raise business risk, but authentication is still required.
Exploitation context
The provided sources do not establish active exploitation, and the CVE is not marked KEV. The CVSS vector includes E:P, indicating proof-of-concept exploit maturity in the supplied data, but no exploit details are provided here.
Researcher notes
The public bundle identifies CWE-284 improper access control and FortiWLC 8.6.1 and below as affected. It does not provide fixed-version details, operational indicators, or confirmed exploitation evidence, so validation should stay focused on version exposure, access paths, and vendor guidance.
Mitigation direction
- Inventory FortiWLC appliances and identify versions 8.6.1 or below.
- Review Fortinet advisory FG-IR-21-200 for vendor-approved remediation or fixed versions.
- Restrict FortiWLC management GUI access to trusted administrative networks.
- Remove unnecessary low-privileged FortiWLC accounts until remediation is complete.
- Monitor FortiWLC administrative activity for unexpected privileged actions.
Validation and detection
- Confirm FortiWLC version from trusted asset records or appliance administration views.
- Verify which users have low-privileged FortiWLC accounts and management access.
- Check whether the management GUI is reachable from untrusted networks.
- Review audit logs for privilege bypass indicators or unexpected admin-level commands.
- Document remediation status against Fortinet advisory FG-IR-21-200.
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.
CVE-2021-42758 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:R
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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:R2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:R
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-21-200CVE reference · x_refsource_CONFIRM
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.