CVE-2021-42757
6.7 · MEDIUMOverview
CVE-2021-42757 is a medium-severity vulnerability affecting fortinet fortiadc. It was published on December 8, 2021 and has a CVSS 3.1 base score of 6.7 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
A buffer overflow [CWE-121] in the TFTP client library of FortiOS before 6.4.7 and FortiOS 7.0.0 through 7.0.2, may allow an authenticated local attacker to achieve arbitrary code execution via specially crafted command line arguments.
Remediation
Check the references section for vendor advisories and patches from fortinet. Update fortiadc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| fortinet | fortiadc | 5.0.0 | Affected |
| fortinet | fortianalyzer | 6.0.0 | Affected |
| fortinet | fortimail | 5.4.0 | Affected |
| fortinet | fortimanager | 6.0.0 | Affected |
| fortinet | fortindr | 1.1.0 | Affected |
| fortinet | fortios-6k7k | 0 | Affected |
| fortinet | fortiportal | 5.0.0 | Affected |
| fortinet | fortiproxy | 1.0.0 | Affected |
| fortinet | fortivoice | 6.0.0 | Affected |
| fortinet | fortiweb | 5.0.0 | Affected |
| fortinet | fortios | 5.0.0 | Affected |
| fortinet | fortirecorder_firmware | 2.6.0 | Affected |
| fortinet | fortiswitch | 6.0.0 | Affected |
Frequently Asked Questions
What is CVE-2021-42757?
CVE-2021-42757 is a medium-severity vulnerability affecting fortinet fortiadc. It was published on December 8, 2021 and has a CVSS 3.1 base score of 6.7 (MEDIUM).
How severe is CVE-2021-42757?
This vulnerability has a CVSS 3.1 base score of 6.7, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-42757?
Check the references section for vendor advisories and patches from fortinet. Update fortiadc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-42757?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-42757 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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