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CVE-2026-20211 is an insecure Java deserialization vulnerability in Cisco Identity Services Engine (ISE). A remote attacker with valid high-privileged administrative credentials can submit a crafted serialized Java object to an affected device and execute arbitrary commands on its underlying operating system. Successful exploitation can provide user-level operating-system access followed by privilege escalation to root. In single-node deployments, exploitation can render the ISE node unavailable and prevent endpoints that have not already authenticated from accessing the network until restoration.
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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.
An authenticated remote command-execution vulnerability in Cisco Identity Services Engine (ISE) caused by insecure Java object deserialization. An attacker with high-privileged administrative credentials can send a crafted serialized Java object to obtain operating-system user access and elevate privileges to root; exploitation in a single-node deployment may also render the ISE node unavailable, preventing unauthenticated endpoints from accessing the network.
Cisco ISE vulnerability that allows an authenticated attacker to execute arbitrary commands on the underlying operating system.
Authenticated operating-system command-execution vulnerability affecting Cisco ISE/ISE-PIC.
An authenticated remote command-execution vulnerability in Cisco Identity Services Engine (ISE) caused by insecure Java-object deserialization. An attacker with high-privileged administrative credentials can send a crafted serialized Java object to gain user-level operating-system access and potentially elevate to root; single-node deployments can become unavailable, preventing 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.