CVE-2026-20211
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the...
Affects 1 product across 1 vendor.
Software deserializes untrusted data without validation, allowing crafted objects to execute arbitrary code.
Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.
A critical severity vulnerability (CVE-2026-20211) affects the target system. A vulnerability in Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid high-privileged administrat...
Is this CVE in your environment?
BreachSpider monitors your ICS/OT environment for vulnerabilities like this one. No agents or network access required. Free to start.
Check My Environment →What is CVE-2026-20211?
What is the CVSS score for CVE-2026-20211?
Is CVE-2026-20211 actively exploited?
How do I remediate CVE-2026-20211?
What systems are affected by CVE-2026-20211?
| CVE ID | CVE-2026-20211 |
|---|---|
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-09-16 |
| Last Modified | 2026-09-18 |
| ICS Relevance | 70% |
| Weakness (CWE) | |
| Source | NVD |
A vulnerability in Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid high-privileged administrative credentials. This vulnerability is due to insecure deserialization of Java objects by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object to an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.
Source: NIST NVD / MITRE CVE Database
| Vendor | Product | Fixed Version |
|---|---|---|
| Cisco | Cisco Identity Services Engine | — |
No patch URL on record. Monitor vendor security advisories directly.
| CISA KEV | Not in KEV catalog |
|---|---|
| Public Exploit | Not confirmed |
| PoC Code | Not confirmed |
Critical Severity - Know Your Exposure
A CVSS 9.1 vulnerability in your ICS environment cannot wait. BreachSpider maps critical CVEs to your specific assets and tells you what to fix first.
Create a free account →