Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2018-13382 is a critical-severity Incorrect Authorization (CWE-863) vulnerability in Fortinet Fortios. Its CVSS base score is 9.1 (Critical).
Operationally, ranked in the top 0.4% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2018-13382 is an improper authorization vulnerability, tracked under CWE-863, that affects the SSL VPN web portal in Fortinet FortiOS versions 6.0.0 through 6.0.4, 5.6.0 through 5.6.8, and 5.4.1 through 5.4.10, as well as FortiProxy versions 2.0.0, 1.2.0 through 1.2.8, 1.1.0 through 1.1.6, and 1.0.0 through 1.0.7. The flaw carries a CVSS v3.1 score of 9.1 and permits unauthorized changes to user credentials through the web portal interface.
An unauthenticated remote attacker can exploit the issue over the network by sending specially crafted HTTP requests to the SSL VPN web portal, enabling modification of an affected user's password. Successful exploitation grants the attacker the ability to change credentials without authentication, resulting in high impact to confidentiality and integrity while availability remains unaffected.
Official Fortinet advisories FG-IR-18-389 and FG-IR-20-231 address the vulnerability and are referenced alongside the CISA Known Exploited Vulnerabilities catalog entry, confirming active exploitation in the wild. Security practitioners should apply the patches or mitigations detailed in those advisories for the listed FortiOS and FortiProxy releases.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2018-5326
Vulnerability Data
An Improper Authorization vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.8 and 5.4.1 to 5.4.10 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 under SSL VPN web portal allows an unauthenticated attacker to modify…
more
the password of an SSL VPN web portal user via specially crafted HTTP requests
- CWE(s)
- KEV Date Added
- 10 January 2022
Related Threats
Threat-Actor AttributionAI
CVEs Like This One
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Periodic review and update of procedures reduces incorrect authorization implementations over time.
Supervision identifies cases where authorization logic incorrectly permits unauthorized actions.
Defining permitted attribute values and auditing modifications reduces the chance of incorrect authorization outcomes due to tampered or missing labels.
The authorization process and usage restrictions help prevent incorrect authorization for remote access types.
Establishing configuration and connection requirements helps ensure correct rather than incorrect authorization for wireless access.
Establishing connection authorization processes for mobile devices helps ensure authorization decisions are correctly implemented rather than incorrect.
Monitoring account use, notifying on changes, and reviewing accounts for compliance corrects incorrect authorization assignments.
Ensures authorization decisions for external system use are correctly implemented and enforced.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Requiring consistency between access rights and classification plus formal approval steps ensures that the authorization logic correctly distinguishes between entities that should and should not be granted access.
A.5.18's provisioning, revocation, review and adjustment of access rights (incl. before role changes/termination, with segregation and owner approval) directly stops incorrect authorization decisions from being exploitable in the vast majority of cases; the bounded remainder is incorrectness inside the authorization logic itself (e.g. flawed conditional or missing check) rather than rights that were wrongly granted.
A.8.3 directly mandates restricting access to information per policies via configuration, identity/group controls, isolation, and dynamic techniques that enforce correct authorization decisions, addressing most but not all slices of CWE-863 (e.g., remainder in non-access-decision authorization errors like timing or environmental factors).
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-863, a class-level weakness, and none of its children carries one either.