CVE-2021-42755 Integer overflow in Fortinet FortiSwitch, FortiRecorder, FortiVoiceEnterprise, FortiOS, FortiProxy

What is CVE-2021-42755?

CVE-2021-42755 is a medium-severity vulnerability in Fortinet Fortios, published on 18 Jul 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An integer overflow / wraparound vulnerability [CWE-190] in FortiSwitch 7.0.2 and below, 6.4.9 and below, 6.2.x, 6.0.x; FortiRecorder 6.4.2 and below, 6.0.10 and below; FortiOS 7.0.2 and below, 6.4.8 and below, 6.2.10 and below, 6.0.x; FortiProxy 7.0.0, 2.0.6 and below, 1.2.x, 1.1.x, 1.0.x; FortiVoiceEnterprise 6.4.3 and below, 6.0.10 and below dhcpd daemon may allow an unauthenticated and network adjacent attacker to crash the dhcpd deamon, resulting in potential denial of service.

Weakness: CWE-190

Which versions are affected by CVE-2021-42755?

It affects 5 products.

Products include Fortinet Fortios, Fortinet Fortiproxy, Fortinet Fortirecorder Firmware, Fortinet Fortiswitch, Fortinet Fortivoice.

How do I fix CVE-2021-42755?

No fix has been published for CVE-2021-42755 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-42755 being exploited?

There is no known exploitation of CVE-2021-42755 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortios

• CVE-2024-23113 Fortinet Multiple Products Format String Exploited Critical 9.8
• CVE-2022-40684 Fortinet Multiple Products Authentication Bypass Exploited Critical 9.8
• CVE-2024-55591 Fortinet FortiOS and FortiProxy Authentication Bypass Exploited Critical 9.6
• CVE-2024-21762 Fortinet FortiOS Out-of-Bound Write Exploited Critical 9.6
• CVE-2022-42475 Fortinet FortiOS Heap-Based Buffer Overflow Exploited Critical 9.3

All Fortinet Fortios vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-v985-ffxm-2rhh.