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CVE-2026-20341 is an insecure deserialization vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software. Untrusted data received over the sftunnel management connection is deserialized insecurely. An authenticated remote attacker with valid administrative credentials on a managed Cisco Firewall Threat Defense (FTD) device can send crafted sftunnel remote procedure calls (RPCs) to gain root privileges on the FMC device and its high-availability peer.
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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.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Authenticated insecure-deserialization vulnerability in Cisco FMC sftunnel leading to root privileges.
An authenticated remote privilege-escalation vulnerability caused by insecure deserialization of untrusted data in the sftunnel inter-device communication protocol of Cisco Secure FMC Software. An attacker with valid administrative credentials on a managed Cisco FTD device can send crafted sftunnel RPCs to gain root privileges on the Cisco Secure FMC device and its high-availability peer.
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.