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CVE-2026-20295 is an improper memory-resource management vulnerability in the sftunnel inter-device communication protocol used by Cisco Secure Firewall Management Center (FMC) Software and Cisco Secure Firewall Threat Defense (FTD) Software. During sftunnel TLS connection setup, crafted TLS frames can cause the affected device to consume available memory without adequate resource management, leading to a denial-of-service condition.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible Cisco Firepower Threat Defense vulnerability with no authentication or user interaction required, affecting availability and potentially crossing a security scope boundary.
A network-accessible Cisco Firepower Management Center vulnerability associated with CWE-295. The supplied CVSS vector indicates low-complexity, unauthenticated exploitation with high availability impact.
An unauthenticated remote denial-of-service vulnerability caused by improper memory-resource management during sftunnel TLS connection setup. Crafted sftunnel TLS frames can exhaust memory on affected Cisco Secure FMC and Cisco Secure FTD 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.