CVE-2021-42757

Published: Dec 8, 2021

Modified: Oct 16, 2025

PUBLISHED

CVSS v3.1

6.3

MEDIUM

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.

Vendor	Product	Versions
Fortinet	FortiOS	affected `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` +3 more versions
Fortinet	FortiDDoS-F	affected `6.4.0 - <= 6.4.1` affected `6.3.0` affected `6.2.0 - <= 6.2.2` affected `6.1.0 - <= 6.1.4`
Fortinet	FortiVoice	affected `6.4.0 - <= 6.4.4` affected `6.0.0 - <= 6.0.10`
Fortinet	FortiProxy	affected `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`
Fortinet	FortiRecorder	affected `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`
Fortinet	FortiPortal	affected `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`
Fortinet	FortiMail	affected `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`
Fortinet	FortiAnalyzer	affected `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`
Fortinet	FortiNDR	affected `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`
Fortinet	FortiDDoS	affected `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` +5 more versions
Fortinet	FortiSwitch	affected `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`
Fortinet	FortiADC	affected `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` +3 more versions
Fortinet	FortiWeb	affected `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` +11 more versions
Fortinet	FortiManager	affected `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`

Weaknesses (CWE)

CWE-120

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

https://fortiguard.com/advisory/FG-IR-21-173

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CVE-2021-42757

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References