---
title: "CVE-2026-20307: Cisco ISE - Remote Code Execution & Privilege Escalation"
description: "Cisco ISE contains an insecure deserialization vulnerability caused by processing user-supplied Java byte streams in the web-based management interface, letting authenticated remote attackers execute arbitrary commands and elevate privileges, exploit requires low-privileged administrative credentials."
url: https://panop.io/threat-heartbeat/CVE-2026-20307/
---

# CVE-2026-20307 Cisco ISE - Remote Code Execution & Privilege Escalation

Cisco ISE contains an insecure deserialization vulnerability caused by processing user-supplied Java byte streams in the web-based management interface, letting authenticated remote attackers execute arbitrary commands and elevate privileges, exploit requires low-privileged administrative credentials.

CVSS base score 9.9 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.95% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-20307)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution, Privilege Escalation, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to the latest Cisco ISE version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-20307](https://nvd.nist.gov/vuln/detail/CVE-2026-20307)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-rce-se7bYU57](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-rce-se7bYU57)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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