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CVE-2025-53843 is a stack-based buffer overflow vulnerability affecting Fortinet FortiOS, including versions 7.6.0 through 7.6.3, 7.4.0 through 7.4.8, and all versions in the 7.2, 7.0, and 6.4 branches. The available reporting indicates the flaw is in the FortiOS/FortiSwitchManager CAPWAP daemon and is triggered by specially crafted packets. The vulnerability stems from improper handling of stack memory, allowing an overwrite of adjacent stack data and potentially control-flow-relevant values. Publicly available content does not disclose the exact vulnerable function, packet format, or code path. One source in the provided content characterizes exploitation as enabling arbitrary code or command execution as a low-privileged user and notes the presence of stack protections and ASLR.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stack-based buffer overflow in FortiOS and FortiSwitchManager CAPWAP daemon that could allow remote code execution by an authenticated attacker posing as a FortiAP or FortiExtender.
A stack-based buffer overflow vulnerability in Fortinet FortiOS that can be triggered by specially crafted packets, potentially allowing arbitrary code or command execution on affected devices.
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.