InfoSecBulletin Cybersecurity for mankind
Fortinet warns customers of a critical security flaw in FortiSIEM which it said there exists an exploit in the wild. CVE-2025-25256 is a critical vulnerability with a CVSS score of 9.8 out of 10.
“An improper neutralization of special elements used in an OS command (‘OS Command Injection’) vulnerability [CWE-78] in FortiSIEM may allow an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests,” the company said in a Tuesday advisory.
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The following versions are impacted by the flaw:
FortiSIEM 6.1, 6.2, 6.3, 6.4, 6.5, 6.6 (Migrate to a fixed release)
FortiSIEM 6.7.0 through 6.7.9 (Upgrade to 6.7.10 or above)
FortiSIEM 7.0.0 through 7.0.3 (Upgrade to 7.0.4 or above)
FortiSIEM 7.1.0 through 7.1.7 (Upgrade to 7.1.8 or above)
FortiSIEM 7.2.0 through 7.2.5 (Upgrade to 7.2.6 or above)
FortiSIEM 7.3.0 through 7.3.1 (Upgrade to 7.3.2 or above)
FortiSIEM 7.4 (Not affected)
Identity Security Risk Assessment:
Fortinet acknowledged in its advisory that a “practical exploit code for this vulnerability was found in the wild,” but did not share any additional specifics about the nature of the exploit and where it was found. It also noted that the exploitation code does not appear to produce distinctive indicators of compromise (IoCs).
The network security company recommends that organizations restrict access to the phMonitor port (7900) as a workaround.
GreyNoise reported a “significant spike” in brute-force traffic targeting Fortinet SSL VPN devices, with numerous IP addresses from the U.S., Canada, Russia, and the Netherlands scanning devices globally. This disclosure was made a day later.
