Security readout for executives and security teams
Plain-English summary
This issue can let certain malformed RAR archives avoid immediate antivirus detection in specified Fortinet products. The reported impact is limited: FortiClient may detect malicious contents during extraction, and FortiGate may detect the archive when Virus Outbreak Prevention is enabled.
Executive priority
Treat as a moderate remediation and configuration-check item, not an emergency based on supplied evidence. Prioritize internet-facing inspection points and endpoints that regularly receive archives.
Technical view
CVE-2020-9295 affects FortiOS 6.2 and 6.4 with AV engine versions at or below listed thresholds, and FortiClient 6.2 with AV engine 6.00137 or below. The CVSS 3.1 score is 4.7, requiring user interaction and affecting integrity at low impact.
Likely exposure
Exposure is most likely where FortiOS 6.2 or 6.4, or FortiClient 6.2, uses the affected AV engine versions and processes RAR archives from email, web, or file-transfer sources.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. It describes a detection gap for malformed or non-standard RAR archives, with detection occurring later under some Fortinet configurations.
Researcher notes
Do not assume all Fortinet products are affected. The evidence names specific FortiOS branches, AV engine thresholds, and FortiClient 6.2. The provided affected metadata is narrower than the description, so rely on Fortinet guidance for exact product status.
Mitigation direction
- Check Fortinet advisory FG-IR-20-037 for vendor-approved remediation guidance.
- Update affected AV engines or products if Fortinet identifies fixed versions.
- Enable Virus Outbreak Prevention on FortiGate where applicable.
- Keep FortiClient real-time scanning enabled for archive extraction events.
- Review mail and web controls for handling malformed RAR archives.
Validation and detection
- Inventory FortiOS and FortiClient versions in use.
- Record AV engine versions and compare them with the affected thresholds.
- Confirm whether FortiGate Virus Outbreak Prevention is enabled.
- Verify FortiClient real-time scanning is active on managed endpoints.
- Review security logs for malformed or non-standard RAR detections.
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
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CWE-358: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-9295 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
- 4.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/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:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:X/RC:X2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.7MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:X/RC:X
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/psirt/FG-IR-20-037CVE reference
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.
Improperly Implemented Security Check for Standard
Improperly Implemented Security Check for Standard represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.