CVE-2021-42755
Last modified
CVE-2021-42755 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fortinet | Fortiproxy | >= 1.0.0, <= 1.0.7 |
| Fortinet | Fortiproxy | >= 1.1.0, <= 1.1.6 |
| Fortinet | Fortiproxy | >= 1.2.0, <= 1.2.13 |
| Fortinet | Fortiproxy | >= 2.0.0, <= 2.0.6 |
| Fortinet | Fortiproxy | 7.0.0 |
| Fortinet | Fortivoice | 5.3.0 |
| Fortinet | Fortivoice | 5.3.1 |
| Fortinet | Fortivoice | 5.3.2 |
| Fortinet | Fortivoice | 5.3.3 |
| Fortinet | Fortivoice | 5.3.4 |
| Fortinet | Fortivoice | 5.3.5 |
| Fortinet | Fortivoice | 5.3.6 |
| Fortinet | Fortivoice | 5.3.7 |
| Fortinet | Fortivoice | 5.3.8 |
| Fortinet | Fortivoice | 5.3.10 |
| Fortinet | Fortivoice | 5.3.11 |
| Fortinet | Fortivoice | 5.3.12 |
| Fortinet | Fortivoice | 5.3.13 |
| Fortinet | Fortivoice | 5.3.14 |
| Fortinet | Fortivoice | 5.3.15 |
| Fortinet | Fortivoice | 5.3.16 |
| Fortinet | Fortivoice | 5.3.17 |
| Fortinet | Fortivoice | 5.3.18 |
| Fortinet | Fortivoice | 5.3.19 |
| Fortinet | Fortivoice | 5.3.20 |
| Fortinet | Fortivoice | 5.3.21 |
| Fortinet | Fortivoice | 5.3.22 |
| Fortinet | Fortivoice | 5.3.23 |
| Fortinet | Fortivoice | 5.3.24 |
| Fortinet | Fortivoice | 5.3.25 |
| Fortinet | Fortivoice | 5.3.26 |
| Fortinet | Fortivoice | 6.0.0 |
| Fortinet | Fortivoice | 6.0.1 |
| Fortinet | Fortivoice | 6.0.2 |
| Fortinet | Fortivoice | 6.0.3 |
| Fortinet | Fortivoice | 6.0.4 |
| Fortinet | Fortivoice | 6.0.5 |
| Fortinet | Fortivoice | 6.0.6 |
| Fortinet | Fortivoice | 6.0.7 |
| Fortinet | Fortivoice | 6.0.8 |
| Fortinet | Fortivoice | 6.0.9 |
| Fortinet | Fortivoice | 6.0.10 |
| Fortinet | Fortivoice | 6.4.0 |
| Fortinet | Fortivoice | 6.4.1 |
| Fortinet | Fortivoice | 6.4.2 |
| Fortinet | Fortivoice | 6.4.3 |
| Fortinet | Fortios | 5.4.0 |
| Fortinet | Fortios | 5.4.1 |
| Fortinet | Fortios | 5.4.2 |
| Fortinet | Fortios | 5.4.3 |
Showing 50 of 130 affected configurations. See NVD for the full list.
References
- https://fortiguard.com/psirt/FG-IR-21-155Patch, Vendor Advisory
- https://fortiguard.com/psirt/FG-IR-21-155Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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