Home/CVE/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 allo
CVE

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 allo

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.

MEDIUM · CVSS 6.7 EPSS 0.00073
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

27
fortinet fortiadc>= 5.0.0 and <= 6.1.5
fortinet fortiadc>= 6.2.0 and <= 6.2.2
fortinet fortianalyzer>= 6.0.0 and <= 6.4.7
fortinet fortianalyzer>= 7.0.0 and <= 7.0.2
fortinet fortimail>= 5.4.0 and <= 6.2.7
fortinet fortimail>= 6.4.0 and <= 6.4.6
fortinet fortimail>= 7.0.0 and <= 7.0.2
fortinet fortimanager>= 6.0.0 and <= 6.4.7
▣

Scoring & Timeline

6.7
MEDIUM · 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 NVD08 Dec 2021 · 11:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://fortiguard.com/advisory/FG-IR-21-173Vendor Advisory
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