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Out-of-bounds Write in FortiADC
CVE-2025-48839 is an out-of-bounds write vulnerability in FortiADC. According to the provided content, affected versions are FortiADC 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, and all versions of 7.2, 7.1, 7.0, and 6.2. The flaw can be triggered by an authenticated attacker via specially crafted HTTP requests, and may result in arbitrary code execution. No additional detail about the specific vulnerable function or code path is provided in the supplied material.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation may allow arbitrary code execution in the context of the affected FortiADC service. This could enable an authenticated attacker to install programs, manipulate or delete data, create accounts, or otherwise fully compromise the affected appliance or its application context, depending on the privileges of the vulnerable process.
If you can’t patch tonight, do this now.
If immediate patching is not possible, reduce exposure of the FortiADC management and application interfaces to trusted networks only, restrict access to authenticated users with least privilege, monitor for anomalous or malformed HTTP requests, and implement network segmentation and compensating controls such as WAF or reverse-proxy filtering where feasible. Increased logging, alerting, and review of administrative activity are also advisable until remediation is completed.
Patch, then assume compromise.
Upgrade FortiADC to a fixed release provided by Fortinet. The supplied content identifies the affected versions as 8.0.0, 7.6.0 through 7.6.2, 7.4.0 through 7.4.7, and all versions of 7.2, 7.1, 7.0, and 6.2; organizations should move to a vendor-remediated version outside those ranges in accordance with Fortinet's advisory. Apply normal patch-management validation and prioritize internet-exposed and high-value administrative interfaces.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.