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CVE-2026-20324 is an improper authorization vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software. A registered sftunnel peer is incorrectly permitted to write an arbitrary file to any location on an affected FMC device. An authenticated remote attacker that hijacks an sftunnel connection or operates as a valid registered peer can issue an sftunnel write operation to place a malicious file that is subsequently executed with root privileges.
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What an attacker gets, and what they’ve been doing with it.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical CWE-862 missing-authorization vulnerability in Cisco Secure Firewall Management Center's sftunnel communication mechanism. An attacker controlling, hijacking, or impersonating a registered sftunnel peer can write arbitrary files and execute commands as root on the FMC management platform.
CVSS 9.9 arbitrary-file-write vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center; an authenticated attacker can obtain root access.
Authenticated arbitrary-file-write vulnerability in Cisco FMC sftunnel that can result in root remote command execution.
An authenticated remote arbitrary-file-write vulnerability in Cisco Secure Firewall Management Center's sftunnel protocol. An attacker with valid FMC credentials who can hijack an sftunnel connection or operate as a registered peer can write a malicious file that executes with root privileges.
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.