Security readout for executives and security teams
Plain-English summary
CVE-2025-20281 is a critical Cisco ISE and ISE-PIC flaw that can let an unauthenticated internet-reachable attacker run code as root. Because ISE is commonly tied to network access control, compromise can affect identity, policy enforcement, and broader network trust.
Executive priority
Treat this as an emergency remediation item. The vulnerability is unauthenticated, remote, root-level, CVSS 10.0, and listed by CISA as known exploited. Cisco ISE often supports critical access-control decisions, so business risk extends beyond one appliance.
Technical view
Cisco describes insufficient validation of user-supplied input in a specific API. A remote attacker with no credentials can send a crafted API request and execute arbitrary operating-system code as root. The CVSS 3.1 score is 10.0, with network attack vector, no privileges, no user interaction, and full confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely in organizations running affected Cisco Identity Services Engine Software versions 3.3.0 through listed 3.3 patches, 3.4.0, or 3.4 Patch 1, and Cisco ISE-PIC where covered by Cisco guidance. Risk is highest where the vulnerable API is reachable from untrusted networks.
Exploitation context
CISA KEV status indicates known exploitation. ZDI also published technical analysis, increasing defender urgency. The provided bundle does not include exploit volume, targeting patterns, or indicators of compromise, so those details should not be assumed.
Researcher notes
Evidence supports root-level unauthenticated RCE through input validation failure in a specific API, mapped to CWE-74. The bundle does not provide complete fixed-version details, workaround text, exploit telemetry, or indicators. Use Cisco’s advisory as the authoritative remediation source and CISA KEV for exploitation status.
Mitigation direction
- Apply Cisco fixed software or guidance from the official advisory immediately.
- Restrict ISE and ISE-PIC administrative/API access to trusted management networks.
- Review Cisco guidance for any named workarounds or compensating controls.
- Prioritize internet-reachable or externally routed deployments first.
- Increase monitoring around ISE API and administrative activity until remediated.
Validation and detection
- Inventory Cisco ISE and ISE-PIC deployments and record exact versions.
- Compare versions against Cisco advisory affected and fixed-release information.
- Confirm whether vulnerable API surfaces are reachable from untrusted networks.
- Review logs for suspicious unauthenticated API or administrative activity.
- After remediation, verify upgraded versions match Cisco fixed guidance.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-74: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-20281 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- cisco-sa-ise-unauth-rce-ZAd2GnJ6CVE reference
- https://www.zerodayinitiative.com/blog/2025/7/24/cve-2025-20281-cisco-ise-api-unauthenticated-remote-code-execution-vulnerabilityCVE reference · exploit, technical-description
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20281CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.