CVE-2025-20223: Cisco Catalyst Center Auth Bypass Flaw

CVE-2025-20223 Overview

Cisco Catalyst Center, formerly Cisco DNA Center, contains an access control vulnerability that allows authenticated remote attackers to read and modify data belonging to an internal service repository. The flaw stems from insufficient enforcement of access control on HTTP requests. An attacker with valid credentials can submit a crafted HTTP request to interact with data handled by an internal service on the affected device. The vulnerability is tracked as [CWE-284: Improper Access Control].

Critical Impact
Authenticated attackers can read and modify data in an internal service repository, affecting the confidentiality and integrity of managed network configuration data within Cisco Catalyst Center.

Affected Products

Cisco Catalyst Center (formerly Cisco DNA Center)
Cisco Catalyst Center appliances exposing the vulnerable HTTP interface
Deployments running versions prior to the fixed release identified in the Cisco security advisory

Discovery Timeline

2025-05-07 - CVE-2025-20223 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-20223

Vulnerability Analysis

The vulnerability resides in the HTTP request handling logic of Cisco Catalyst Center. The platform fails to properly enforce access control checks when authenticated users submit requests targeting an internal service repository. Because authorization decisions are not consistently enforced at the API layer, an authenticated user can access resources that should be restricted to internal service accounts.

Exploitation requires network reachability to the Catalyst Center management interface and valid credentials with high privileges. The impact is limited to a subset of data handled by a single internal service, not the entire platform. However, successful exploitation lets an attacker both read and modify that data, which can affect downstream network operations that rely on the repository.

This class of flaw, categorized as improper access control under CWE-284, is common in centralized network management platforms where multiple internal microservices share HTTP-based communication channels. Without strict per-service authorization, boundaries between administrative roles and internal service identities break down.

Root Cause

The root cause is insufficient authorization enforcement on HTTP endpoints exposed by an internal service within Catalyst Center. The application authenticates the requester but does not verify that the requester holds the specific role required to access or mutate the target repository. Access control checks are missing or incomplete at the endpoint handler layer.

Attack Vector

Exploitation requires the attacker to authenticate to Catalyst Center over the network. Once authenticated, the attacker crafts an HTTP request targeting the affected internal service endpoint. The server processes the request without validating whether the caller has permission to interact with the repository, returning or modifying data on the attacker's behalf. No user interaction is required beyond the initial authenticated session.

No public proof-of-concept exploit or in-the-wild exploitation has been reported. Refer to the Cisco Security Advisory on Access Control for full technical details.

Detection Methods for CVE-2025-20223

Indicators of Compromise

Unexpected HTTP requests from authenticated administrative accounts targeting internal service API paths on Catalyst Center
Modifications to internal service repository data that do not correlate with legitimate administrative workflows or change tickets
Authenticated sessions originating from unusual source IP addresses or during off-hours administrative windows

Detection Strategies

Enable and centralize Catalyst Center audit logs to capture all authenticated HTTP API calls, including source IP, user, endpoint, and response code
Baseline normal API usage per administrative account and alert on deviations targeting internal service endpoints
Correlate configuration drift in Catalyst Center-managed devices against authorized change records to identify unauthorized modifications

Monitoring Recommendations

Forward Catalyst Center syslog and API audit events to a centralized SIEM for long-term retention and correlation
Monitor authentication events for privileged Catalyst Center accounts and alert on anomalous logon patterns
Track integrity of internal repository data through periodic configuration snapshots and diff-based alerting

How to Mitigate CVE-2025-20223

Immediate Actions Required

Apply the fixed Catalyst Center release identified in the Cisco Security Advisory on Access Control
Restrict network access to the Catalyst Center management interface to trusted administrative networks only
Review and reduce the number of accounts with high-privilege access to Catalyst Center
Rotate credentials for privileged Catalyst Center users and enforce multi-factor authentication where supported

Patch Information

Cisco has published a security advisory for this vulnerability. Administrators should consult the Cisco Security Advisory on Access Control for the specific fixed software versions applicable to their deployment and upgrade guidance. No workaround is documented; upgrading to a fixed release is the primary remediation.

Workarounds

Limit management-plane access using network segmentation, access control lists, and jump hosts to reduce the pool of potential authenticated attackers
Enforce role-based access control and the principle of least privilege for all Catalyst Center accounts
Continuously audit privileged account activity and disable unused administrative accounts

bash

# Example: restrict Catalyst Center management access at the network edge
# Replace <mgmt-subnet> and <catalyst-center-ip> with environment-specific values
access-list 150 permit tcp <mgmt-subnet> 0.0.0.255 host <catalyst-center-ip> eq 443
access-list 150 deny   tcp any host <catalyst-center-ip> eq 443 log
access-list 150 permit ip any any
interface GigabitEthernet0/1
 ip access-group 150 in