---
title: "CVE-2025-20337: Cisco Identity Services Engine Injection Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-20337/
description: "CVE-2025-20337 (Cisco Identity Services Engine): Exploited in the wild (CISA KEV). A vulnerability in a specific API of Cisco ISE and Cisco ISE-PIC could…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-07-16
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-20337"
kev: true
cvss: 10
epss: 0.74499
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-20337: Cisco Identity Services Engine Injection Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Cisco Identity Services Engine. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-07-28, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-08-18 ; treat that as the outer limit, not the target.
- EPSS 74.5% , percentile 99: FIRST’s model estimates a 74.5% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- Cisco Cisco Identity Services Engine Software: 3.3.0, 3.3 Patch 2, 3.3 Patch 1, 3.3 Patch 3, 3.4.0, 3.3 Patch 4, 3.4 Patch 1, 3.3 Patch 5, 3.3 Patch 6
- Cisco Cisco ISE Passive Identity Connector: 3.2.0, 3.1.0, 3.3.0, 3.4.0

## Severity

- cisco CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-07-28; federal due date 2025-08-18. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 74.50% probability of exploitation activity in the next 30 days; percentile 99.

## Sources

- [Listed in CISA KEV notes (sec.cloudapps.cisco.com)](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-unauth-rce-ZAd2GnJ6)
- [CVE.org record CVE-2025-20337](https://www.cve.org/CVERecord?id=CVE-2025-20337)
- [NVD entry CVE-2025-20337](https://nvd.nist.gov/vuln/detail/CVE-2025-20337)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20337)

---
Source page: https://erroneo.us/security/cve/CVE-2025-20337/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt