Fortinet FortiWeb - Padding oracle in cookie encryption (FG-IR-21-126)

medium Nessus Plugin ID 171887


Fortinet Firewall is missing one or more security-related updates.


The version of FortiWeb installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-21-126 advisory.

- An improper verification of cryptographic signature vulnerability [CWE-347] in FortiOS,FortiWeb, FortiProxy and FortiSwitchmay allow an attackerto decrypt portions of the administrative session management cookie if able to intercept the latter.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to FortiWeb version 6.3.17 / 7.0.0 or later.

See Also

Plugin Details

Severity: Medium

ID: 171887

File Name: fortiweb_FG-IR-21-126.nasl

Version: 1.1

Type: local

Family: Firewalls

Published: 2/24/2023

Updated: 3/10/2023

Supported Sensors: Nessus

Risk Information


Risk Factor: Low

Score: 1.4


Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:N/A:N

CVSS Score Source: CVE-2021-43074


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:fortinet:fortiproxy

Required KB Items: Host/Fortigate/model, Host/Fortigate/version

Exploit Ease: No known exploits are available

Patch Publication Date: 2/16/2023

Vulnerability Publication Date: 2/16/2023

Reference Information

CVE: CVE-2021-43074

IAVA: 2023-A-0110-S