CASCACascade Atlas

Evidence dossier

CVE-2018-13383

CVE-2018-13383

62.4–82.9Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
May 29, 2019
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS33.65%

2026-07-18 · v2026.06.15 · percentile 98.2%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

fortinetoriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

Fortinet FortiOS and FortiProxy Out-of-bounds Write

FIRST EPSSoriginal assertion
model_probability

Probability 0.336470000000; percentile 0.982020000000

Applicability

Cited product scope

Trace impact →
FortinetFortinet FortiOS and FortiProxy
[{"status": "affected", "version": "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, FortiProxy 2.0.0, 1.2.8 and earlier"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*; end excluding 1.2.9supported
Unknown vendorUnknown product
cpe:2.3:a:fortinet:fortiproxy:2.0.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*; start including 5.2.0; end excluding 5.2.15supported
Unknown vendorUnknown product
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*; start including 5.4.0; end excluding 5.4.13supported
Unknown vendorUnknown product
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*; start including 5.6.0; end excluding 5.6.11supported
Unknown vendorUnknown product
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*; start including 6.0.0; end excluding 6.0.5supported

Assessments

CVSS by origin

6.5
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:N/C:N/I:N/A:P
4.3
psirt@fortinet.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.3
fortinetCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.