CVE-2021-36173

HIGH

FortiOS 6.0.0-6.0.13, 6.2.0-6.2.9, 6.4.0-6.4.6, 7.0.0-7.0.1 - Remote Code Execution via Crafted Installation Image

Title source: llm

Description

A heap-based buffer overflow in the firmware signature verification function of FortiOS versions 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, and 6.0.0 through 6.0.13 may allow an attacker to execute arbitrary code via specially crafted installation images.

References (1)

Core 1

Core References

Patch, Vendor Advisory x_refsource_confirm

https://fortiguard.com/advisory/FG-IR-21-115

Scores

CVSS v3 8.0

EPSS 0.0067

EPSS Percentile 71.6%

Attack Vector ADJACENT_NETWORK

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-787

Status published

Products (3)

fortinet/fortios 7.0.0

fortinet/fortios 7.0.1

fortinet/fortios 6.0.0 - 6.0.13

Published Dec 08, 2021

Tracked Since Feb 18, 2026