Security readout for executives and security teams
Plain-English summary
FortiClientEMS contained a flaw that could let a logged-in attacker manipulate server-side file paths through Deployment Package names. The reported impact is limited integrity and availability damage, not data theft. Risk depends on who can authenticate to the EMS console and manage deployment packages.
Executive priority
Treat this as a moderate-priority infrastructure hygiene issue. It is not reported as actively exploited here, but EMS manages endpoint security deployment, so unauthorized file changes could disrupt operations. Prioritize upgrade and access review for any exposed affected EMS server.
Technical view
CVE-2020-15941 is a CWE-22 path traversal issue in FortiClientEMS 6.4.1 and below and 6.2.8 and below. An authenticated network attacker with low privileges could inject traversal sequences in the Deployment Packages name parameter to add or delete server files. CVSS v3.1 is 5.4.
Likely exposure
Organizations running the listed FortiClientEMS 6.4.x or 6.2.x versions are potentially exposed, especially where EMS access is broadly available to administrators or operators. The source bundle does not identify affected cloud services, agents, or other Fortinet products.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires authentication and no user interaction. The CVSS vector indicates low attack complexity, low privileges, and limited integrity and availability impact.
Researcher notes
Key unknowns are the exact filesystem write/delete boundaries, fixed version details, and practical exploit maturity beyond the provided CVSS vector. Validate only in authorized environments and focus on version exposure, role requirements, and EMS server-side file integrity evidence.
Mitigation direction
- Review Fortinet advisory FG-IR-20-074 for vendor-approved remediation guidance.
- Upgrade FortiClientEMS to a vendor-supported non-affected release where applicable.
- Restrict FortiClientEMS console access to trusted administrators only.
- Review deployment package permissions and remove unnecessary operator access.
- Monitor for unexpected deployment package creation, deletion, or file changes.
Validation and detection
- Inventory FortiClientEMS versions and compare against the affected version list.
- Confirm whether Deployment Package management is available to low-privileged users.
- Review EMS audit logs for unusual package names or file operations.
- Check file integrity on the EMS server for unexpected additions or deletions.
- Document compensating access controls if immediate upgrade is not complete.
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.
File access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-15941 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:N/I:L/A:L/E:F/RL:X/RC:X
CNA and ADP enrichment extracted from CVE v5
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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:L/E:F/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:N/I:L/A:L/E:F/RL:X/RC:X
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-20-074CVE 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.