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CVE-2018-13383 (GCVE-0-2018-13383)

Vulnerability from cvelistv5 – Published: 2019-05-29 17:20 – Updated: 2025-10-21 23:45
VLAI CISA Previdian
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.
Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: active Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-23 13:33 UTC
CWE
  • Denial of service
  • CWE-787 - Out-of-bounds Write
Assigner
References
Impacted products
Vendor Product Version CPE status
Fortinet Fortinet FortiOS and FortiProxy Affected: 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
guessed Create a notification for this product.
Date Public
2019-04-02 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f4b3f231-7402-4351-be4a-51346c441bfd

Vulnerability ID: CVE-2018-13383

Status: Confirmed

Status Updated: 2022-01-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-01-10
Asserted: 2022-01-10
Scope
Notes: KEV entry: Fortinet FortiOS and FortiProxy Out-of-bounds Write | Affected: Fortinet / FortiOS and FortiProxy | Description: A heap buffer overflow in Fortinet FortiOS and FortiProxy may cause the SSL VPN web service termination for logged in users. | Required action: Apply updates per vendor instructions. | Due date: 2022-07-10 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2018-13383
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-787
Feed CISA Known Exploited Vulnerabilities Catalog
Product FortiOS and FortiProxy
Due Date 2022-07-10
Date Added 2022-01-10
Vendorproject Fortinet
Vulnerabilityname Fortinet FortiOS and FortiProxy Out-of-bounds Write
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 13:25 UTC | Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d47c795e-5770-48ca-ac20-5b55a8f3e68d

Vulnerability ID: CVE-2018-13383

Status: Confirmed

Status Updated: 2022-01-10 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-01-10
Asserted: 2022-01-10
Scope
Notes: KEVIntel entry: 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... | Affected: Fortinet / Fortinet FortiOS and FortiProxy | CVSS: 4.3 (MEDIUM) | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor Fortinet
Product Fortinet FortiOS and FortiProxy
Added Date 2022-01-10T00:00:00.000Z
Cvss Score 4.3
Epss Score None
Cvss Severity MEDIUM
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website
To clipboard 

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                  "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"
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          "datePublic": "2019-04-02T00:00:00.000Z",
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            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 4.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
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          ],
          "problemTypes": [
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                {
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                  "lang": "en",
                  "type": "text"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2021-03-09T16:01:31.000Z",
            "orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
            "shortName": "fortinet"
          },
          "references": [
            {
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://fortiguard.com/advisory/FG-IR-18-388"
            },
            {
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://fortiguard.com/advisory/FG-IR-20-229"
            }
          ],
          "x_legacyV4Record": {
            "CVE_data_meta": {
              "ASSIGNER": "psirt@fortinet.com",
              "ID": "CVE-2018-13383",
              "STATE": "PUBLIC"
            },
            "affects": {
              "vendor": {
                "vendor_data": [
                  {
                    "product": {
                      "product_data": [
                        {
                          "product_name": "Fortinet FortiOS and FortiProxy",
                          "version": {
                            "version_data": [
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                "baseSeverity": "Medium",
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            "problemtype": {
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                },
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        "assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
        "assignerShortName": "fortinet",
        "cveId": "CVE-2018-13383",
        "datePublished": "2019-05-29T17:20:03.000Z",
        "dateReserved": "2018-07-06T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:45:36.261Z",
        "state": "PUBLISHED"
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    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.