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             AUSCERT External Security Bulletin Redistribution

              FortiOS - heap-based buffer overflow in sslvpnd
                             13 December 2022


        AusCERT Security Bulletin Summary

Product:           FortiOS
Publisher:         Fortinet
Operating System:  Network Appliance
Resolution:        Patch/Upgrade
CVE Names:         CVE-2022-42475  

Original Bulletin: 

Comment: CVSS (Max):  9.3 CVE-2022-42475 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: Fortinet
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Revision History:  December 13 2022: Flagging as an 'Alert' - Rated 'Critical' severity, by Fortinet.
                   December 13 2022: Initial Release

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FortiOS - heap-based buffer overflow in sslvpnd

IR Number    : FG-IR-22-398
Date         : Dec 12, 2022
Severity     : Critical
CVSSv3 Score : 9.3
Impact       : Execute unauthorized code or commands
CVE ID       : CVE-2022-42475
Affected Products:

FortiOS: 7.2.2, 7.2.1, 7.2.0, 7.0.8, 7.0.7, 7.0.6, 7.0.5, 
7.0.4, 7.0.3, 7.0.2, 7.0.1, 7.0.0, 6.4.9, 6.4.8, 6.4.7, 6.4.6, 6.4.5, 6.4.4, 
6.4.3, 6.4.2, 6.4.10, 6.4.1, 6.4.0, 6.2.9, 6.2.8, 6.2.7, 6.2.6, 6.2.5, 6.2.4, 
6.2.3, 6.2.2, 6.2.11, 6.2.10, 6.2.1, 6.2.0

Language     : English, Portuguese


A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN may
allow a remote unauthenticated attacker to execute arbitrary code or commands
via specifically crafted requests.

Exploitation status:

Fortinet is aware of an instance where this vulnerability was exploited in the
wild, and recommends immediately validating your systems against the following
indicators of compromise:

Multiple log entries with:

Logdesc="Application crashed" and msg="[...] application:sslvpnd,[...], Signal
11 received, Backtrace: [...]"

Presence of the following artifacts in the filesystem:


Connections to suspicious IP addresses from the FortiGate:,30081,30443,20443,444

Affected Products

FortiOS version 7.2.0 through 7.2.2
FortiOS version 7.0.0 through 7.0.8
FortiOS version 6.4.0 through 6.4.10
FortiOS version 6.2.0 through 6.2.11
FortiOS-6K7K version 7.0.0 through 7.0.7
FortiOS-6K7K version 6.4.0 through 6.4.9
FortiOS-6K7K version 6.2.0 through 6.2.11
FortiOS-6K7K version 6.0.0 through 6.0.14


Please upgrade to FortiOS version 7.2.3 or above
Please upgrade to FortiOS version 7.0.9 or above
Please upgrade to FortiOS version 6.4.11 or above
Please upgrade to FortiOS version 6.2.12 or above
Please upgrade to FortiOS-6K7K version 7.0.8 or above
Please upgrade to FortiOS-6K7K version 6.4.10 or above
Please upgrade to FortiOS-6K7K version 6.2.12 or above
Please upgrade to FortiOS-6K7K version 6.0.15 or above

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