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CVE Record

CVE-2018-13380: A Cross-site Scripting (XSS) vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.7, 5.4.0 to 5.4...

A Cross-site Scripting (XSS) vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.7, 5.4.0 to 5.4.12, 5.2 and below and Fortinet FortiProxy 2.0.0, 1.2.8 and below under SSL VPN web portal allows attacker to execute unauthorized malicious script code via the error or message handling parameters.

MediumCVSS 4.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a cross-site scripting issue in the Fortinet SSL VPN web portal. A malicious actor could cause script to run in a user's browser if that user interacts with crafted error or message handling content. The source bundle does not show active exploitation or a confirmed patch level.

Executive priority

Treat as a moderate-priority VPN edge hygiene issue. It is not described as actively exploited in the provided sources, but internet-facing VPN portals are sensitive assets and affected versions should be remediated through Fortinet guidance.

Technical view

CVE-2018-13380 affects FortiOS and FortiProxy SSL VPN web portal handling of error or message parameters. CVSS 3.1 is 4.7: network reachable, low complexity, no attacker privileges, user interaction required, changed scope, low confidentiality impact, no integrity or availability impact.

Likely exposure

Exposure is most likely where affected FortiOS or FortiProxy versions expose the SSL VPN web portal to users. Listed versions include FortiOS 6.0.0-6.0.4, 5.6.0-5.6.7, 5.4.0-5.4.12, 5.2 and earlier, and FortiProxy 2.0.0, 1.2.8 and earlier.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. The CVSS vector indicates exploitation requires user interaction, so risk centers on phishing or crafted navigation targeting VPN portal users rather than fully automated compromise.

Researcher notes

Evidence is limited to the CVE record, CVE List entry, and Fortinet advisory URLs. The source bundle does not provide exploit details, CWE mapping, named fixed versions, or proof of exploitation. Avoid assuming impact beyond browser-executed script in the SSL VPN web portal context.

Mitigation direction

  • Inventory FortiOS and FortiProxy systems exposing SSL VPN web portals.
  • Compare running versions against the affected version ranges.
  • Review Fortinet advisories FG-IR-18-383 and FG-IR-20-230 for official remediation.
  • Apply only Fortinet-supported updates or mitigations for the affected branch.
  • Reduce unnecessary SSL VPN portal exposure while remediation is planned.

Validation and detection

  • Confirm FortiOS or FortiProxy version and SSL VPN portal status.
  • Identify whether the system falls within the listed affected ranges.
  • Review web portal access logs for suspicious error or message parameter activity.
  • Verify the final state against Fortinet advisory guidance.
  • Document any compensating controls if immediate update is not possible.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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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CVE-2018-13380 mapping review

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Vulnerability profileCVE Program record
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:L/I:N/A:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4.7CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.7Medium
CVSS 3.1 vector shape for CVE-2018-13380Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
FortinetFortinet FortiOS and FortiProxyFortiGate 6.0.0 through 6.0.4, 5.6.0 through 5.6.7, 5.4.0 through 5.4.12, 5.2 and earlier and FortiProxy versions 2.0.0, 1.2.8 and earlierListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.