CVE-2015-5736

Status: ModifiedHigh (7.2)—💥 Exploit

The Fortishield.sys driver in Fortinet FortiClient before 5.2.4 allows local users to execute arbitrary code with kernel privileges by setting the callback function in a (1) 0x220024 or (2) 0x220028 ioctl call.

CVSS

Version: 2.0
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Base score: 7.2

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 2.03%
Percentile among all scored CVEs: 80
Score date: 10/7/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Published on Exploit-DB · Fortinet FortiClient 5.2.3 (Windows 10 x64 Creators) - Local Privilege Escalation (8/5/2018)
Published on Exploit-DB · Fortinet FortiClient 5.2.3 (Windows 10 x64 Pre-Anniversary) - Local Privilege Escalation (3/25/2017)
Published on Exploit-DB · Fortinet FortiClient 5.2.3 (Windows 10 x64 Post-Anniversary) - Local Privilege Escalation (3/25/2017)
Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Fortinet — Forticlient

CWEs

CWE-264

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2015-5736",
  "cveTags": [],
  "metrics": {
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      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
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          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
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        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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      "affectedData": [
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          "versions": [
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              "status": "affected",
              "version": "n/a"
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  "published": "2015-09-03T14:59:06.647",
  "references": [
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      "url": "http://fortiguard.com/advisory/mulitple-vulnerabilities-in-forticlient",
      "source": "cve@mitre.org"
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    {
      "url": "http://packetstormsecurity.com/files/133398/FortiClient-Antivirus-Information-Exposure-Access-Control.html",
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    {
      "url": "http://seclists.org/fulldisclosure/2015/Sep/0",
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      "value": "The Fortishield.sys driver in Fortinet FortiClient before 5.2.4 allows local users to execute arbitrary code with kernel privileges by setting the callback function in a (1) 0x220024 or (2) 0x220028 ioctl call."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad en el driver Fortishield.sys en Fortinet FortiClient en versiones anteriores a 5.2.4, permite a usuarios locales ejecutar código arbitrario con privilegios de kernel mediante el establecimiento de la función callback en llamada ioctl en (1) 0x220024 o (2) 0x220028."
    }
  ],
  "lastModified": "2026-06-17T00:29:40.907",
  "configurations": [
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}