Security readout for executives and security teams
Plain-English summary
This Fortinet vulnerability can let a low-privileged attacker obtain configured LDAP login credentials by abusing a connectivity test flow. CISA lists it in the Known Exploited Vulnerabilities catalog, so treat affected internet-facing or administrator-accessible appliances as urgent despite the medium CVSS score.
Executive priority
Prioritize remediation this cycle, especially for appliances managing authentication. KEV status makes this more urgent than the medium CVSS score suggests. The main business risk is theft of LDAP credentials, which may enable further access depending on account privilege and directory controls.
Technical view
CVE-2018-13374 is improper access control in FortiOS and FortiADC. The source describes an attacker redirecting an LDAP server connectivity test to a rogue LDAP server, exposing LDAP credentials configured in FortiGate. The CVSS vector is network, low complexity, low privileges, no user interaction, confidentiality impact only.
Likely exposure
Exposure is likely where affected FortiOS or FortiADC versions are still deployed and reachable by users with appliance access. Affected versions listed are FortiOS 6.0.2 and 5.6.7 and before, FortiADC 6.1.0, 6.0.0 to 6.0.1, and 5.4.0 to 5.4.4.
Exploitation context
CISA KEV inclusion supports known exploitation. The source bundle does not provide exploit volume, affected campaigns, or technical proof-of-concept details. Exploitation requires low privileges according to CVSS, reducing anonymous exposure but still creating credential-theft risk inside management or operations workflows.
Researcher notes
The provided evidence identifies the vulnerability class, affected ranges, CVSS vector, and KEV status, but does not include patch versions or detailed detection indicators. Avoid assuming anonymous exploitation; CVSS states privileges are required. Focus validation on version exposure, LDAP configuration, credential rotation, and log review.
Mitigation direction
- Confirm whether any listed FortiOS or FortiADC versions remain in service.
- Review Fortinet advisory FG-IR-18-157 for vendor-specified fixed versions and remediation.
- Restrict management and appliance administration access to trusted networks and users.
- Rotate LDAP credentials configured on affected Fortinet appliances after remediation.
- Review directory permissions for exposed LDAP accounts and reduce privileges where possible.
Validation and detection
- Inventory FortiOS and FortiADC versions against the affected version ranges.
- Check whether LDAP authentication or LDAP server settings are configured on affected appliances.
- Review appliance logs for unusual LDAP connectivity tests or configuration activity.
- Review LDAP server logs for unexpected authentication attempts from appliance-related accounts.
- Confirm remediated appliances no longer run versions listed as affected.
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.
CWE-732: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-13374 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
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
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.
CISA KEV status
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:N/A:N2.81.4Primary 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:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://fortiguard.com/advisory/FG-IR-18-157CVE reference · x_refsource_CONFIRM
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13374CVE reference · government-resource
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.
Incorrect Permission Assignment for Critical Resource
Incorrect Permission Assignment for Critical Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.