Cisco Identity Services Engine Injection Vulnerability (CVE-2025-20281)

Historical catalog analysis: CISA added this entry on July 28, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.

What the vulnerability is

CVE-2025-20281 is an injection vulnerability (CWE-74) affecting a specific API within Cisco Identity Services Engine (ISE) and Cisco ISE-PIC. The flaw stems from insufficient validation of user-supplied input. An attacker could exploit this by submitting a crafted API request, which may result in remote code execution (RCE) with root privileges on the affected device.

Exposure and applicability

This vulnerability applies to organizations deploying Cisco Identity Services Engine or Cisco ISE-PIC. Because the flaw exists within an API, exposure is primarily determined by the accessibility of that API to untrusted or unauthorized actors. The inclusion of this CVE in CISA’s Known Exploited Vulnerabilities (KEV) catalog as of July 28, 2025, indicates that the vulnerability has been observed in active exploitation, increasing the urgency for infrastructure owners to identify and secure these assets.

Remediation priorities

Our analysis suggests prioritizing remediation based on the following hierarchy:

1. Immediate Asset Identification: Vulnerability management teams should first identify all instances of Cisco ISE and Cisco ISE-PIC within the environment to establish a baseline of exposure.
2. Vendor Mitigation Application: Following the vendor’s specific security advisory is the primary corrective action. This may involve applying software updates or configuration changes as specified by Cisco.
3. Access Restriction: For systems where immediate patching is not feasible, restricting network access to the affected API can serve as a temporary compensating control to reduce the likelihood of external exploitation.

How to validate remediation

Verification must move beyond simple version checks, as a deployed update does not always guarantee that the vulnerability is mitigated in a specific environment. To verify that exposure has been reduced, defenders should:

• Confirm Patch Application: Verify through system logs or vendor-provided tools that the specific security update addressing CVE-2025-20281 has been successfully installed and initialized.
• Validate API Input Handling: Where authorized, use safe testing methods to ensure the affected API no longer accepts the crafted inputs described in the vulnerability research.
• Audit Access Controls: Confirm that network segmentation or firewall rules are actively blocking unauthorized traffic to the management interfaces of the ISE deployment.

Limits and open questions

While vendor mitigations address the root cause, residual risk remains if the API is exposed to a wide internal network where lateral movement could occur. It remains unknown whether this vulnerability has been utilized in specific ransomware campaigns. Additionally, while CISA has set a remediation deadline of August 18, 2025, for federal agencies, non-federal organizations must determine their own risk appetite and patching cadence based on their specific exposure.

Source and editorial note

CVE-2025-20281: Cisco Identity Services Engine Injection Vulnerability · Source date: July 28, 2025 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

Archive date: July 31, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 07, 2026 at 00:17 UTC.

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