CVE-2018-13383 kev+ ransomware in the critical feed json
A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiPro…
published 2019-05-29 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-5327
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Exploited
- added 2022-01-10, used in ransomware
- epss
- 30.7%
- EPSS 30.7% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.
Patch / fix
cisa required action Apply updates per vendor instructions.
- fortinet fortiproxy 1.2.9
- fortinet fortios 5.2.15, 5.4.13, 5.6.11, 6.0.5
Timeline
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 4 y ago
- Patch by
- 2022-07-10 (4 y ago)
- Ransomware
- Known to be used in ransomware campaigns
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Fortinet, FortiOS and FortiProxy
- CISA name
- Fortinet FortiOS and FortiProxy Out-of-bounds Write
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
30.67% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Affected products
- Fortinet Fortinet FortiOS and FortiProxy
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
- Technology feeds
References
-
fortiguard.com
/advisory/FG-IR-18-388
mitigation, vendor-advisory
-
fortiguard.com
/advisory/FG-IR-20-229
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-13383
government-resource, us-government-resource
Sources
- CVE List CVE-2018-13383
- NVD CVE-2018-13383
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.