Fortinet Cautions Users: Attackers Staying Hidden in Networks Despite Patches
Fortinet has issued a warning that cybercriminals continue to lurk in networks even after organisations have patched known vulnerabilities in Fortinet products. Attackers who exploited older flaws have managed to maintain persistence by using compromised credentials, backdoor accounts, or hidden footholds. Although many organisations patched their Fortinet systems following public disclosures and guidance, the intruders had already established enough access to remain undetected over extended periods. Fortinet urges users to thoroughly examine their network logs, revoke suspicious credentials, and verify that older exploits have not granted attackers ongoing access.
Fortinet has sounded the alarm that even after patching critical bugs in its security products, attackers can still remain inside compromised environments. According to the company, many businesses were quick to apply updates when Fortinet disclosed vulnerabilities earlier in the year. However, hackers had already gained a foothold—through stolen credentials or hidden backdoors—allowing them to maintain persistent access.
Main Concerns
1. Post-Patch Dangers: While installing patches is essential, simply updating software may not remove attackers who have already established a presence.
2. Hidden Credentials: Once cybercriminals gain admin-level privileges, they can create shadow accounts or malicious scripts designed to stay under the radar.
3. Fortinet’s Advice: Organisations are urged to do more than patch; they must conduct detailed reviews of user accounts and access logs, and invalidate any suspicious credentials. Traditional endpoint scanning is also recommended to spot unusual activity.
What Should You Do Next?
• Scrutinise logs for unauthorised logins or unexpected access patterns.
• Reset or remove questionable accounts—especially those with admin privileges.
• Employ multi-factor authentication (MFA) and strong password policies across your Fortinet devices and other critical infrastructure.
By combining swift patching with deeper forensic analysis, you stand a better chance of driving out hidden attackers and safeguarding your network’s long-term health.