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CVE-2025-20124

Cisco Identity Services Engine remote code execution

9.9 CRITICALEPSS 18.5%
  1. Published5 Feb 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

Affected products

Cisco Identity Services Engine< 3.1 · 3.1.0 · 3.2.0 · 3.3.0

Remediation

Fixed in
Cisco Identity Services Engine≥ 3.1

Frequently asked

Is CVE-2025-20124 being actively exploited?

CVE-2025-20124 is not in the CISA KEV catalog. Its EPSS exploit probability is 18.5%.

How severe is CVE-2025-20124?

CVE-2025-20124 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 18.5% probability of exploitation.

Which products are affected by CVE-2025-20124?

Affected products include Cisco Identity Services Engine.

How do I fix CVE-2025-20124?

Upgrade affected software to a fixed version, for example Cisco Identity Services Engine 3.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-20124 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.