Fortinet Releases Advisory on New Post-Exploitation Technique for Known Vulnerabilities

Fortinet Releases Advisory on New Post-Exploitation Technique for Known Vulnerabilities ↗ source

April 11, 2025 CISA Alert

Source: https://www.cisa.gov/news-events/alerts/2025/04/11/fortinet-releases-advisory-new-post-exploitation-technique-known-vulnerabilities

Summary

Fortinet is aware of a threat actor creating a malicious file from previously exploited Fortinet vulnerabilities (CVE-2024-21762, CVE-2023-27997, and CVE-2022-42475) within FortiGate products. This malicious file could enable read-only access to files on the device's file system, which may include configurations. Fortinet has communicated directly with the account holders of customers identified as impacted by this issue based on the available telemetry with mitigation guidance. See the following resource for more information: Analysis of Threat Actor Activity | Fortinet Blog Upgrade to FortiOS versions 7.6.2, 7.4.7, 7.2.11, 7.0.17, 6.4.16 to remove the malicious file and prevent re-compromise. As a work-around mitigation until the patch is applied, consider disabling SSL-VPN functionality, as exploitation of the file requires the SSL-VPN to be enabled. For more mitigation information: Recommended steps to execute in case of a... - Fortinet Community .

News Coverage

Date	Source	Article
2026-06-24	Kaspersky Securelist	StrikeShark: investigating a new campaign delivering Cobalt Strike through SharkLoader CVE-2024-21762

Articles from the monitored vendor research blogs and security news feeds that reference a CVE cited in this publication, or name the campaign it covers. Coverage begins when feed monitoring started; earlier articles are not indexed.

CVEs Referenced in This Publication

CVE	CVSS	Affected
CVE-2024-21762	9.6 Critical	Fortinet FortiOS Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially…
CVE-2022-42475	9.3 Critical	Fortinet FortiOS Multiple versions of Fortinet FortiOS SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker …
CVE-2023-27997	9.2 Critical	Fortinet FortiOS and FortiProxy SSL-VPN Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to exe…

Extracted from the publication text. Each CVE links to its tracked detail page.

Vendors Named in This Publication

Fortinet 30 KEV

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.