Security readout for executives and security teams
Plain-English summary
This FortiAuthenticator issue could let an attacker duplicate an LDAP user’s two-factor authentication token. That threatens account protection because a copied token can undermine MFA trust for affected users. The CVSS score is high, but the vector also indicates high privileges and user interaction are required.
Executive priority
Treat this as high priority for identity infrastructure. It targets MFA token integrity, which can affect account takeover risk, but available evidence does not support emergency active-exploitation language.
Technical view
CVE-2021-43067 affects Fortinet FortiAuthenticator 6.4.0, 6.3.2 and below, 6.2.1 and below, 6.1.2 and below, and 6.0.7 through 6.0.1. Crafted HTTP requests can expose sensitive information and duplicate a target LDAP user’s 2FA token. CVSS 3.1 is 8.3: AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L.
Likely exposure
Exposure is most likely where affected FortiAuthenticator versions manage LDAP users and two-factor authentication tokens. Internet or broad network reachability increases concern, but the provided CVSS vector indicates exploitation requires high privileges and user interaction.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The CVSS temporal metric indicates proof-of-concept exploit maturity, but no cited source here confirms exploitation in the wild.
Researcher notes
The advisory data is narrow: no CWE is listed, and no fixed versions are provided in the bundle. Focus validation on affected FortiAuthenticator versions, LDAP-backed MFA use, privilege requirements, and any vendor guidance in FG-IR-21-211.
Mitigation direction
- Identify all FortiAuthenticator deployments and record exact versions.
- Review Fortinet advisory FG-IR-21-211 for vendor-approved upgrade or mitigation guidance.
- Prioritize remediation for systems managing LDAP-backed MFA tokens.
- Restrict management and user-facing access to FortiAuthenticator where operationally possible.
- Review privileged accounts with access to affected FortiAuthenticator workflows.
Validation and detection
- Compare deployed FortiAuthenticator versions against the affected version list.
- Confirm whether LDAP users and 2FA tokens are managed on each appliance.
- Review FortiAuthenticator logs for unusual token-management or user-management HTTP activity.
- Check whether compensating access controls limit who can reach FortiAuthenticator interfaces.
- Verify remediation status against Fortinet’s advisory, not inferred fixed versions.
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.
Credential 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-2021-43067 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
- 8.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L/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:H/UI:R/S:C/C:H/I:H/A:L/E:P/RL:X/RC:X1.76Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.3HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L/E:P/RL:X/RC:X
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-21-211CVE 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.