Home/CVE/Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability
CVE

CVE-2022-42475

Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN 7.2.0 through 7.2.2, 7.0.0 through 7.0.8, 6.4.0 through 6.4.10, 6.2.0 through 6.2.11, 6.0.15 and earlier and FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.

CRITICAL · CVSS 9.8 ⚠ CISA KEV EPSS 0.94005 Ransomware: known
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • Linked to known ransomware campaigns
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules10 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

◆

Threat Actors Linked

2
actorPlay
actorVolt Typhoon
⬡

Weakness Classification

CWE-197Numeric Truncation Error
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

18
fortinet fortios>= 5.0.0 and <= 5.0.14
fortinet fortios>= 5.2.0 and <= 5.2.15
fortinet fortios>= 5.4.0 and <= 5.4.13
fortinet fortios>= 5.6.0 and <= 5.6.14
fortinet fortios>= 6.0.0 and < 6.0.16
fortinet fortios>= 6.2.0 and < 6.2.12
fortinet fortios>= 6.4.0 and < 6.4.11
fortinet fortios>= 7.0.0 and < 7.0.9
⚠

Public Exploits & PoCs

1
pocfortiguard.com · FG-IR-22-398fortiguard.com
◈

Sigma Hunt Rules

10
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
relatedcriticalAntivirus Password Dumper Detection
relatedcriticalHacktool Execution - Imphash
relatedcriticalHackTool - Rubeus Execution
relatedcriticalPotential Credential Dumping Via LSASS Process Clone
relatedcriticalWCE wceaux.dll Access
relatedcriticalHackTool - Dumpert Process Dumper Default File
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · psirt@fortinet.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD02 Jan 2023 · 09:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

4
siemens-csafSSA-770770
siemens-csafSSA-366067
cisaKEV-CVE-2022-42475
cisa-csafcisa-csaf-csaf_files-OT-white-2025-icsa-25-044-06
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-42475US Government Resource
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