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CVE-2026-20307 is an insecure deserialization vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE). An authenticated remote attacker with at least low-privileged administrative credentials can submit a crafted serialized Java object that is insecurely deserialized from a user-supplied byte stream. Successful exploitation can execute arbitrary commands or code on the underlying operating system and elevate privileges to root. In single-node deployments, exploitation may also make the ISE node unavailable and prevent endpoints that have not already authenticated from accessing the network until the node is restored.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Cisco ISE vulnerability that allows an authenticated attacker to execute arbitrary commands on the underlying operating system.
Authenticated operating-system command-execution vulnerability in the Cisco ISE web management interface.
An authenticated remote command-execution and privilege-escalation vulnerability in Cisco Identity Services Engine (ISE)'s web-based management interface. An attacker with at least low-privileged administrative credentials can submit a crafted serialized Java object, execute code as root, and potentially render a single-node ISE deployment unavailable.
An authenticated remote code-execution and privilege-escalation vulnerability in Cisco ISE's web-based management interface caused by insecure deserialization of a user-supplied Java byte stream. An attacker with low-privileged administrative credentials can send a crafted serialized Java object to execute code as root. In single-node deployments, exploitation may also render the ISE node unavailable and prevent unauthenticated endpoints from accessing the network.
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.