Fortinet has issued a warning regarding a critical out-of-bounds write vulnerability in FortiOS.
Remote attackers can exploit this vulnerability to execute arbitrary code, posing a significant security threat.
A vulnerability known as CVE-2024-21762 (with a CVSSv3 Score of 9.6) can be taken advantage of through a specific type of HTTP request. This vulnerability enables an attacker to execute code or commands using custom-crafted requests.
Fortinet has suggested disabling SSL VPN as a workaround to address the security vulnerability affecting SSL VPN web portals. It is important to note that disabling web mode alone is not a valid workaround.
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Following are the Versions Affected
| Version | Affected | Solution |
| FortiOS 7.6 | Not affected | Not Applicable |
| FortiOS 7.4 | 7.4.0 through 7.4.2 | Upgrade to 7.4.3 or above |
| FortiOS 7.2 | 7.2.0 through 7.2.6 | Upgrade to 7.2.7 or above |
| FortiOS 7.0 | 7.0.0 through 7.0.13 | Upgrade to 7.0.14 or above |
| FortiOS 6.4 | 6.4.0 through 6.4.14 | Upgrade to 6.4.15 or above |
| FortiOS 6.2 | 6.2.0 through 6.2.15 | Upgrade to 6.2.16 or above |
| FortiOS 6.0 | 6.0 all versions | Migrate to a fixed release |
Fortinet has warned that hackers are actively exploiting the vulnerability in question. Significantly, the exploitation is not limited to theoretical attacks but occurs in real-world scenarios.
FortiSIEM recently addressed several OS command injection vulnerabilities, namely CVE-2024-23108 and CVE-2024-23109, prompting an advisory release.
According to the latest reports, Chinese state-sponsored hackers recently took advantage of a zero-day vulnerability (CVE-2022-42475) in Fortinet’s virtual private network to gain unauthorized access to the Dutch defense networks.
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