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Status published
Medium
CVE-2021-42757
A buffer overflow [CWE-121] in the TFTP client library of...
Vulnerability Description
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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
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Affected Vendor
Fortinet
View all reports →Affected Software
FortiOS, FortiDDoS-F, FortiVoice, FortiProxy, FortiRecorder, FortiPortal, FortiMail, FortiAnalyzer, FortiNDR, FortiDDoS, FortiSwitch, FortiADC, FortiWeb, FortiManager
Vulnerable Versions:
7.0.0, 6.4.0, 6.2.0, 6.0.0, 5.6.0, 5.4.0, 5.2.0, 5.0.0, 6.3.0, 6.1.0, 2.0.0, 1.2.0, 1.1.0, 1.0.0, 2.7.0, 2.6.0, 5.3.0, 5.1.0, 1.5.0, 1.4.0, 1.3.0, 5.5.0, 4.7.0, 4.6.0, 4.5.0, 4.4.0, 5.9.0, 5.8.5, 5.8.0, 5.7.0
Timeline
Official Publish:
December 8th, 2021
Last Modified:
October 16th, 2025
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C