vulnerability
Fortinet FortiOS: Out-of-bounds Write (CVE-2020-12820)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:L/Au:S/C:N/I:P/A:P) | Dec 19, 2024 | Jan 27, 2025 | Aug 11, 2025 |
Severity
6
CVSS
(AV:N/AC:L/Au:S/C:N/I:P/A:P)
Published
Dec 19, 2024
Added
Jan 27, 2025
Modified
Aug 11, 2025
Description
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.
Solutions
fortios-upgrade-5_6_13fortios-upgrade-6_0_11
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