Security readout for executives and security teams
Plain-English summary
FortiAuthenticator 6.4.0 has an authentication flaw that may let a valid user bypass the second factor during RADIUS login portal authentication. This weakens MFA for affected deployments, but the provided sources do not show active exploitation or broader affected versions.
Executive priority
Treat as a targeted MFA weakness rather than a broad perimeter compromise. It deserves prompt remediation if FortiAuthenticator 6.4.0 protects important remote access, VPN, or privileged workflows.
Technical view
CVE-2021-43068 is improper authentication in Fortinet FortiAuthenticator 6.4.0. The CVSS 3.1 vector is 5.4: network reachable, low complexity, low privileges required, no user interaction, with limited confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is limited to Fortinet FortiAuthenticator version 6.4.0, specifically deployments using the RADIUS login portal. Systems on other versions are not listed as affected in the provided bundle.
Exploitation context
The bundle marks KEV as false, so there is no cited evidence of active exploitation. The CVSS temporal vector includes exploit maturity as proof-of-concept, but no exploit details or weaponization guidance are provided here.
Researcher notes
The provided evidence is sparse: affected version 6.4.0, RADIUS login portal path, and CVSS metadata. Do not assume other FortiAuthenticator versions, active exploitation, or specific fixes without consulting Fortinet FG-IR-21-212.
Mitigation direction
- Check Fortinet advisory FG-IR-21-212 for fixed versions or vendor workarounds.
- Prioritize moving FortiAuthenticator 6.4.0 off the affected release using vendor guidance.
- Limit RADIUS login portal exposure where business operations allow.
- Monitor authentication logs for unusual second-factor bypass patterns.
Validation and detection
- Inventory FortiAuthenticator appliances and confirm any running version 6.4.0.
- Verify whether the RADIUS login portal is enabled on affected systems.
- Review MFA/RADIUS authentication logs for unexpected successful logins.
- Document compensating controls until vendor remediation is applied.
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-2021-43068 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
- Medium
- CVSS
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:X/RC:X
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:L/I:L/A:N/E:P/RL:X/RC:X2.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:X/RC:X
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-21-212CVE 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.