Vulnerabilities > CVE-2020-12820 - Out-of-bounds Write vulnerability in Fortinet Fortios

CVSS 8.8 - HIGH

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

LOW

Confidentiality impact

HIGH

Integrity impact

HIGH

Availability impact

HIGH

network

low complexity

fortinet

CWE-787

NVD

Published: 2024-12-19

Updated: 2025-01-21

Summary

Under non-default configuration, a stack-based buffer overflow in FortiOS version 6.0.10 and below, version 5.6.12 and below may allow a remote attacker authenticated to the SSL VPN to crash the FortiClient NAC daemon (fcnacd) and potentially execute arbitrary code via requesting a large FortiClient file name. We are not aware of proof of concept code successfully achieving the latter.

Vulnerable Configurations

Part	Description	Count
OS	Fortinet Fortinet Fortios 6.0.0 Fortinet Fortios 6.0.1 Fortinet Fortios 6.0.2 Fortinet Fortios 6.0.3 Fortinet Fortios 6.0.4 Fortinet Fortios 6.0.5 Fortinet Fortios 6.0.6 Fortinet Fortios 6.0.7 Fortinet Fortios 6.0.8 Fortinet Fortios 6.0.9 Fortinet Fortios 6.0.10 Fortinet Fortios 3.1.0 Fortinet Fortios 3.2.0 Fortinet Fortios 3.3.0 Fortinet Fortios 3.3.3 Fortinet Fortios 3.3.5 Fortinet Fortios 3.3.6 Fortinet Fortios 3.3.7 Fortinet Fortios 3.3.8 Fortinet Fortios 3.3.9 Fortinet Fortios 3.3.10 Fortinet Fortios 3.3.11 Fortinet Fortios 3.3.12 Fortinet Fortios 3.3.13 Fortinet Fortios 3.3.14 Fortinet Fortios 3.4.0 Fortinet Fortios 3.4.1 Fortinet Fortios 3.4.2 Fortinet Fortios 3.4.3 Fortinet Fortios 3.4.4 Fortinet Fortios 3.4.5 Fortinet Fortios 3.5.0 Fortinet Fortios 3.5.1 Fortinet Fortios 3.5.2 Fortinet Fortios 3.5.3 Fortinet Fortios 3.5.4 Fortinet Fortios 3.5.5 Fortinet Fortios 3.5.6 Fortinet Fortios 3.5.7 Fortinet Fortios 3.6.0 Fortinet Fortios 3.6.1 Fortinet Fortios 3.6.2 Fortinet Fortios 3.6.3 Fortinet Fortios 3.6.4 Fortinet Fortios 3.6.5 Fortinet Fortios 3.6.6 Fortinet Fortios 3.7.0 Fortinet Fortios 3.7.1 Fortinet Fortios 3.7.2 Fortinet Fortios 3.7.3 Fortinet Fortios 3.7.4 Fortinet Fortios 3.7.5 Fortinet Fortios 3.7.6 Fortinet Fortios 3.7.7 Fortinet Fortios 3.7.8 Fortinet Fortios 3.7.9 Fortinet Fortios 3.7.10 Fortinet Fortios 4.0.0 Fortinet Fortios 4.0.1 Fortinet Fortios 4.0.2 Fortinet Fortios 4.0.3 Fortinet Fortios 4.0.4 Fortinet Fortios 4.1.0 Fortinet Fortios 4.1.1 Fortinet Fortios 4.1.2 Fortinet Fortios 4.1.3 Fortinet Fortios 4.1.4 Fortinet Fortios 4.1.5 Fortinet Fortios 4.1.6 Fortinet Fortios 4.1.7 Fortinet Fortios 4.1.8 Fortinet Fortios 4.1.9 Fortinet Fortios 4.1.10 Fortinet Fortios 4.1.11 Fortinet Fortios 4.2.0 Fortinet Fortios 4.2.1 Fortinet Fortios 4.2.2 Fortinet Fortios 4.2.3 Fortinet Fortios 4.2.4 Fortinet Fortios 4.2.5 Fortinet Fortios 4.2.6 Fortinet Fortios 4.2.7 Fortinet Fortios 4.2.8 Fortinet Fortios 4.2.9 Fortinet Fortios 4.2.10 Fortinet Fortios 4.2.11 Fortinet Fortios 4.2.12 Fortinet Fortios 4.2.13 Fortinet Fortios 4.2.14 Fortinet Fortios 4.2.15 Fortinet Fortios 4.2.16 Fortinet Fortios 4.3.0 Fortinet Fortios 4.3.1 Fortinet Fortios 4.3.2 Fortinet Fortios 4.3.3 Fortinet Fortios 4.3.4 Fortinet Fortios 4.3.5 Fortinet Fortios 4.3.6 Fortinet Fortios 4.3.7 Fortinet Fortios 4.3.8 Fortinet Fortios 4.3.9 Fortinet Fortios 4.3.10 Fortinet Fortios 4.3.11 Fortinet Fortios 4.3.12 Fortinet Fortios 4.3.13 Fortinet Fortios 4.3.14 Fortinet Fortios 4.3.15 Fortinet Fortios 4.3.16 Fortinet Fortios 4.3.17 Fortinet Fortios 4.3.18 Fortinet Fortios 4.3.19 Fortinet Fortios 5.0 Fortinet Fortios 5.0.0 Fortinet Fortios 5.0.1 Fortinet Fortios 5.0.2 Fortinet Fortios 5.0.3 Fortinet Fortios 5.0.4 Fortinet Fortios 5.0.5 Fortinet Fortios 5.0.6 Fortinet Fortios 5.0.7 Fortinet Fortios 5.0.8 Fortinet Fortios 5.0.9 Fortinet Fortios 5.0.10 Fortinet Fortios 5.0.11 Fortinet Fortios 5.0.12 Fortinet Fortios 5.0.13 Fortinet Fortios 5.0.14 Fortinet Fortios 5.2.0 Fortinet Fortios 5.2.1 Fortinet Fortios 5.2.2 Fortinet Fortios 5.2.3 Fortinet Fortios 5.2.4 Fortinet Fortios 5.2.5 Fortinet Fortios 5.2.6 Fortinet Fortios 5.2.7 Fortinet Fortios 5.2.8 Fortinet Fortios 5.2.9 Fortinet Fortios 5.2.10 Fortinet Fortios 5.2.11 Fortinet Fortios 5.2.12 Fortinet Fortios 5.2.13 Fortinet Fortios 5.2.14 Fortinet Fortios 5.2.15 Fortinet Fortios 5.4 Fortinet Fortios 5.4.0 Fortinet Fortios 5.4.1 Fortinet Fortios 5.4.2 Fortinet Fortios 5.4.3 Fortinet Fortios 5.4.4 Fortinet Fortios 5.4.5 Fortinet Fortios 5.4.6 Fortinet Fortios 5.4.7 Fortinet Fortios 5.4.8 Fortinet Fortios 5.4.9 Fortinet Fortios 5.4.10 Fortinet Fortios 5.4.11 Fortinet Fortios 5.4.12 Fortinet Fortios 5.4.13 Fortinet Fortios 5.6.0 Fortinet Fortios 5.6.1 Fortinet Fortios 5.6.2 Fortinet Fortios 5.6.3 Fortinet Fortios 5.6.4 Fortinet Fortios 5.6.5 Fortinet Fortios 5.6.6 Fortinet Fortios 5.6.7 Fortinet Fortios 5.6.8 Fortinet Fortios 5.6.9 Fortinet Fortios 5.6.10 Fortinet Fortios 5.6.11 Fortinet Fortios 5.6.12	171

Common Weakness Enumeration (CWE)

CWE-787 - Out-of-bounds Write

References

https://fortiguard.fortinet.com/psirt/FG-IR-20-083