CVE-2025-20124
Cisco Identity Services Engine Java Deserialization Vulnerability
- Published
- Feb 5, 2025
- Updated
- Feb 26, 2026
- Assigning CNA
- cisco
- Evidence observed
- Aug 11, 2025
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:HModerate · next 30 days
- Percentile
- 97.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
A vulnerability in an API of Cisco ISE could allow an authenticated, remote attacker to execute arbitrary commands as the root user on an affected device. This vulnerability is due to insecure deserialization of user-supplied Java byte streams by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object to an affected API. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges. Note: To successfully exploit this vulnerability, the attacker must have valid read-only administrative credentials. In a single-node deployment, new devices will not be able to authenticate during the reload time.
Sources
2- CVE-2026-20180Research
In-depth technical analysis of Cisco ISE RCE vulnerabilities, including exploitation techniques, evasion methods, and remediation strategies for security researchers and penetration testers.
İbrahimsql · multiple · Aug 11, 2025
Responsible use
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