Out-of-bounds write in FortiOS CAPWAP daemon
CVE-2025-53844 is an out-of-bounds write vulnerability in the CAPWAP daemon of Fortinet FortiOS. It affects FortiOS 7.6.0 through 7.6.3, 7.4.0 through 7.4.8, and 7.2.0 through 7.2.11. The flaw can be triggered with specially crafted or malformed CAPWAP packets, causing memory corruption in the CAPWAP-handling process. Available reporting indicates exploitation requires an attacker to control an access point endpoint or other authenticated CAPWAP-connected device, such as a FortiAP, FortiExtender, or FortiSwitch, and then send malicious CAPWAP traffic to the FortiGate/FortiOS device. The vulnerability is tracked by Fortinet as FG-IR-26-123.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity out-of-bounds write flaw in the FortiOS CAPWAP daemon that could let an attacker controlling an authenticated Fortinet access point endpoint crash or compromise the FortiOS process.
A medium-severity out-of-bounds write vulnerability in the FortiOS CAPWAP daemon that could let an attacker controlling an access point endpoint crash or potentially compromise the FortiOS process.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.