CVE-2025-20257: Cisco Secure Network Analytics Auth Bypass

CVE-2025-20257 Overview

Cisco disclosed CVE-2025-20257, an authorization flaw in the API subsystem of Cisco Secure Network Analytics Manager and Cisco Secure Network Analytics Virtual Manager. An authenticated remote attacker with low privileges can call a specific API with crafted input to generate fraudulent findings. These findings then feed the alarms and alerts pipeline of the appliance.

Successful exploitation lets an attacker obfuscate legitimate detections in analytics reports or inject false indications across the console. The weakness maps to CWE-863: Incorrect Authorization. It affects the integrity of monitoring data without exposing confidentiality or availability of the platform.

Critical Impact
Authenticated low-privileged attackers can forge security findings, suppress real alerts, and undermine the trust analysts place in Secure Network Analytics dashboards.

Affected Products

Cisco Secure Network Analytics Manager
Cisco Secure Network Analytics Virtual Manager
Cisco Secure Network Analytics version 7.5.2

Discovery Timeline

2025-05-21 - CVE-2025-20257 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-20257

Vulnerability Analysis

The flaw resides in an API endpoint exposed by Secure Network Analytics Manager. The endpoint accepts requests from authenticated users but does not verify that the caller holds the role required to create findings. Findings are the internal records that the appliance converts into alarms and alerts displayed to analysts.

Because authorization is only enforced at the session level, any low-privileged account can invoke the endpoint. The attacker submits crafted payloads that the Manager ingests and treats as legitimate detections. The resulting alerts appear indistinguishable from those produced by the analytics engine itself.

The impact centers on integrity. Analysts can be flooded with fabricated alerts that mask real intrusions, or legitimate findings can be buried beneath attacker-controlled noise. This weakens incident response workflows and detection fidelity across the monitored network.

Root Cause

The root cause is insufficient authorization enforcement on a specific API handler. The handler checks that the requester is authenticated but omits a role or privilege check before writing findings into the alert pipeline. This classifies the issue under CWE-863.

Attack Vector

Exploitation requires network access to the Manager's API and valid credentials for any low-privileged account. No user interaction is needed. The attacker issues an API call with a crafted body that targets the vulnerable finding-creation path. Refer to the Cisco Security Advisory for endpoint specifics.

Detection Methods for CVE-2025-20257

Indicators of Compromise

Unusual spikes in alarm or alert volume originating from a single analytics source or user session.
API audit log entries showing finding-creation calls from accounts that normally only perform read operations.
Alerts whose contents reference hosts, flows, or signatures that do not correlate with any ingested telemetry.

Detection Strategies

Enable and forward Secure Network Analytics Manager API audit logs to a central SIEM for correlation.
Baseline the normal rate and sources of finding creation, then alert on deviations tied to low-privileged accounts.
Cross-reference alarms against raw flow telemetry to identify alerts without supporting network evidence.

Monitoring Recommendations

Monitor authentication events for low-privileged service accounts interacting with the Manager API.
Track creation timestamps and originating session IDs on all new findings to spot clustered or scripted submissions.
Review analyst workflows for sudden increases in dismissed or duplicate alerts, which can indicate injected noise.

How to Mitigate CVE-2025-20257

Immediate Actions Required

Apply the fixed software release listed in the Cisco Security Advisory cisco-sa-sna-apiacv-4B6X5ysw.
Audit all local and remote accounts on the Manager and remove unused low-privileged users.
Rotate credentials for any account that has API access to the Manager.

Patch Information

Cisco has published a security advisory and remediated software release for Secure Network Analytics Manager and Virtual Manager. Administrators running 7.5.2 should upgrade to the fixed version identified in the Cisco advisory. No official workarounds are provided by Cisco.

Workarounds

Restrict network reachability of the Manager API to trusted management subnets only.
Enforce least privilege on Manager roles and avoid issuing API-capable accounts to users who do not require them.
Enable multi-factor authentication for all Manager accounts to raise the cost of credential compromise.