Security readout for executives and security teams
Plain-English summary
This FortiWeb flaw can let a logged-in attacker misuse redirect functionality so the appliance helps reach external or protected hosts. The business concern is not full device takeover, but misuse of a security gateway as a trusted path into places it should not expose.
Executive priority
Treat as a timely hygiene fix for affected FortiWeb deployments, especially in sensitive network positions. It is medium severity, but the appliance role can raise business relevance if it bridges trusted and protected environments.
Technical view
CVE-2021-43064 is an open redirect issue in Fortinet FortiWeb 6.4.1, 6.4.0, 6.3.15 and below, and 6.2.6 and below. CVSS 3.1 is 4.3, network exploitable, low complexity, requiring low privileges, with low integrity impact.
Likely exposure
Exposure is likely limited to organizations still running the listed FortiWeb versions. Risk is higher where authenticated users or compromised accounts can access vulnerable redirect handlers and where FortiWeb can reach sensitive internal or protected hosts.
Exploitation context
The supplied data does not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates exploitation requires low privileges and no user interaction. Evidence supports possible misuse as a proxy via redirect handlers, not unauthenticated takeover.
Researcher notes
The source bundle does not include fixed-version details or exploit telemetry. Analysis should stay bounded to the Fortinet affected version list, CVSS vector, and described redirect-handler proxy behavior. Validate exposure through versioning and network reachability, not exploit reproduction.
Mitigation direction
- Identify all FortiWeb appliances and their running versions.
- Compare versions against the affected FortiWeb 6.4, 6.3, and 6.2 ranges.
- Review Fortinet FG-IR-21-168 for vendor-approved upgrade or mitigation guidance.
- Prioritize remediation for FortiWeb systems that can reach protected internal hosts.
- Reduce unnecessary access to vulnerable FortiWeb interfaces until remediated.
Validation and detection
- Confirm FortiWeb version from asset inventory or administrative records.
- Map which users or roles can access FortiWeb redirect functionality.
- Review whether FortiWeb has network paths to protected hosts.
- Check change records for remediation aligned to Fortinet advisory FG-IR-21-168.
- Monitor for unusual redirect or proxy-like access patterns where logging is available.
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-2021-43064 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/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:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-21-168CVE 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.