Vulnerability in Cisco Identity Services Engine Software
CVE-2025-20337
A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying operating system as root. The attacker does not require any valid credentials to exploit this vulnerability. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to obtain root privileges on an affected device.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.745 (99.5th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.676 · newest: 0.745 · change: +0.069
Affected products
- Cisco Identity Services Engine Software — versions 3.3.0, 3.3 Patch 2, 3.3 Patch 1
- Cisco Ise Passive Identity Connector — versions 3.2.0, 3.1.0, 3.3.0
- Cisco Identity Services Engine — versions 3.3.0, 3.4.0
- Cisco Identity Services Engine Passive Connector — versions 3.3.0, 3.4.0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public proof-of-concept exploits
References
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-… (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2025-20337?
- CVE-2025-20337 is a critical-severity vulnerability in Cisco Identity Services Engine Software, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 10.0/10. Published 2025-07-16.
- How severe is CVE-2025-20337?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2025-20337 known to be exploited?
- Yes. CVE-2025-20337 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-07-28), indicating it is being actively exploited. 7 public proof-of-concept repositories are indexed.