CVE-2025-20124

Cisco Identity Services Engine Java Deserialization Vulnerability

At a glance

Severity
CRITICAL 9.9
EPSS
EPSS 18.48 % · percentile 97 (2026-10-28)
State
PUBLISHED
Published
Updated
Assigner
cisco
NVD status
Analyzed

Description

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.

Scores

VersionScoreVectorScored by
CVSS 3.1CRITICAL 9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:Hcisco
CVSS 3.1CRITICAL 9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:HNVD · psirt@cisco.com (Secondary)
CVSS 3.1HIGH 7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Cisco · Cisco Identity Services Engine Softwareaffected 3.0.0 ; affected 3.0.0 p1 ; affected 3.0.0 p2 ; affected 3.0.0 p3 ; affected 3.1.0 ; affected 3.0.0 p4
Cisco · Cisco ISE Passive Identity Connectoraffected 3.0.0 ; affected 3.2.0 ; affected 3.1.0 ; affected 3.3.0

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD