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CVE-2026-20242 is an insecure deserialization vulnerability in the External Database Access feature of Cisco Secure Firewall Management Center (FMC) Software. The feature processes user-supplied serialized Java byte streams received from hosts configured in the external database access list. An unauthenticated remote attacker controlling an allowed host can send a crafted byte stream to a specific TCP port on an affected FMC device, resulting in arbitrary command execution as root.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unauthenticated external-database SQL-execution vulnerability in Cisco FMC with potential command-execution impact.
An insecure Java deserialization vulnerability in Cisco Secure Firewall Management Center Software's External Database Access feature that can permit an unauthenticated remote attacker controlling an allowlisted external-database host to execute arbitrary commands and obtain root privileges on the FMC device.
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.