THREATPORT/VULNERABILITY/CVE-2025-20124
CRITICAL SEVERITY

CVE-2025-20124

Identity Services Engine vulnerability

CVSS
9.9
EPSS
18.5%
EPSS pct
97th
Exploited
No known
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.
Affected vendor
Cisco
Affected product
Identity Services Engine
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H
Weakness type (CWE)
  • CWE-502 — Deserialization of Untrusted Data
Published
2025-02-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to low impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 18.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2025-20124

  • Confirm whether Cisco Identity Services Engine is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2025-20124.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-20124

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2025-20124 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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