Vulnerability Intelligence Report
CVE-2021-42757
A buffer overflow [CWE-121] in the TFTP client library of FortiOS before 6.4.7 and FortiOS 7.0.0 through 7.0.2, may allow an authenticated local attacker to achieve arbitrary code execution via specially crafted command line arguments.
No Active Exploit Signals
CVSS Base Score
6.3
MEDIUM
Exploitability:0.8
Impact Score:5.9
EPSS Probability:0.48%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-120 ↗Execute unauthorized code or commands
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Fortinet | FortiOS | 7.0.0 <= 7.0.2 (affected), 6.4.0 <= 6.4.7 (affected), 6.2.0 <= 6.2.9 (affected), 6.0.0 <= 6.0.13 (affected), 5.6.0 <= 5.6.14 (affected), 5.4.0 <= 5.4.13 (affected), 5.2.0 <= 5.2.15 (affected), 5.0.0 <= 5.0.14 (affected) |
| Fortinet | FortiDDoS-F | 6.4.0 <= 6.4.1 (affected), 6.3.0 (affected), 6.2.0 <= 6.2.2 (affected), 6.1.0 <= 6.1.4 (affected) |
| Fortinet | FortiVoice | 6.4.0 <= 6.4.4 (affected), 6.0.0 <= 6.0.10 (affected) |
| Fortinet | FortiProxy | 7.0.0 <= 7.0.1 (affected), 2.0.0 <= 2.0.7 (affected), 1.2.0 <= 1.2.13 (affected), 1.1.0 <= 1.1.6 (affected), 1.0.0 <= 1.0.7 (affected) |
| Fortinet | FortiRecorder | 6.4.0 <= 6.4.2 (affected), 6.0.0 <= 6.0.10 (affected), 2.7.0 <= 2.7.7 (affected), 2.6.0 <= 2.6.3 (affected) |
| Fortinet | FortiPortal | 6.0.0 <= 6.0.10 (affected), 5.3.0 <= 5.3.8 (affected), 5.2.0 <= 5.2.6 (affected), 5.1.0 <= 5.1.2 (affected), 5.0.0 <= 5.0.3 (affected) |
| Fortinet | FortiMail | 7.0.0 <= 7.0.2 (affected), 6.4.0 <= 6.4.6 (affected), 6.2.0 <= 6.2.7 (affected), 6.0.0 <= 6.0.12 (affected), 5.4.0 <= 5.4.12 (affected) |
| Fortinet | FortiAnalyzer | 7.0.0 <= 7.0.2 (affected), 6.4.0 <= 6.4.7 (affected), 6.2.0 <= 6.2.13 (affected), 6.0.0 <= 6.0.12 (affected) |
| Fortinet | FortiNDR | 1.5.0 <= 1.5.2 (affected), 1.4.0 (affected), 1.3.0 <= 1.3.1 (affected), 1.2.0 (affected), 1.1.0 (affected) |
| Fortinet | FortiDDoS | 5.5.0 <= 5.5.1 (affected), 5.4.0 <= 5.4.3 (affected), 5.3.0 <= 5.3.2 (affected), 5.2.0 (affected), 5.1.0 (affected), 5.0.0 (affected), 4.7.0 (affected), 4.6.0 (affected), 4.5.0 (affected), 4.4.0 <= 4.4.2 (affected) |
| Fortinet | FortiSwitch | 7.0.0 <= 7.0.3 (affected), 6.4.0 <= 6.4.9 (affected), 6.2.0 <= 6.2.7 (affected), 6.0.0 <= 6.0.7 (affected) |
| Fortinet | FortiADC | 6.2.0 <= 6.2.2 (affected), 6.1.0 <= 6.1.5 (affected), 6.0.0 <= 6.0.4 (affected), 5.4.0 <= 5.4.5 (affected), 5.3.0 <= 5.3.7 (affected), 5.2.0 <= 5.2.8 (affected), 5.1.0 <= 5.1.7 (affected), 5.0.0 <= 5.0.4 (affected) |
| Fortinet | FortiWeb | 6.4.0 <= 6.4.1 (affected), 6.3.0 <= 6.3.16 (affected), 6.2.0 <= 6.2.8 (affected), 6.1.0 <= 6.1.4 (affected), 6.0.0 <= 6.0.8 (affected), 5.9.0 <= 5.9.2 (affected), 5.8.5 <= 5.8.7 (affected), 5.8.0 <= 5.8.3 (affected), 5.7.0 <= 5.7.3 (affected), 5.6.0 <= 5.6.2 (affected), 5.5.0 <= 5.5.7 (affected), 5.4.0 <= 5.4.1 (affected), 5.3.0 <= 5.3.9 (affected), 5.2.0 <= 5.2.4 (affected), 5.1.0 <= 5.1.4 (affected), 5.0.0 <= 5.0.6 (affected) |
| Fortinet | FortiManager | 7.0.0 <= 7.0.2 (affected), 6.4.0 <= 6.4.7 (affected), 6.2.0 <= 6.2.13 (affected), 6.0.0 <= 6.0.12 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.479%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Fortinet, Inc. · Vendor · USA |
| Reserved | 2021-10-20T00:00:00 |
| Published | 2021-12-08T11:01:11 |
| Last Updated | 2025-10-16T09:46:26 |
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